School System C# Code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace SchoolSystem
{
// Written by : Paul Smyth
// Date of last issue : 9/9/2015
//
// This is the logon screen. It takes a user ID and a password from the user
// and checks it against the data stored in the Teachers / Administration tables.
//
public partial class LogonForm : Form
{
SchoolDataClassesDataContext DB = new SchoolDataClassesDataContext();
//This variable defines the menu access option based on the Person Type
public static string personType = "";
// This variable stores the user ID so that it can be used
// elsewhere in the program
public static string personID = "";
public LogonForm()
{
InitializeComponent();
}
private void btnExit_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void btnLogon_Click(object sender, EventArgs e)
{
try
{
// look up ID in Persons database and test to see if the
// one entered is valid. If valid, return the Type value
// so that the password can be checked.
var loginTest = (from i in DB.Persons
where i.ID == Int32.Parse(txtUserID.Text)
select i.Type).First();
if (loginTest == "Administrator")
{
// lookup password from Administrator file
var passwordTest = (from p in DB.Administrations
where p.AID == Int32.Parse(txtUserID.Text)
select p.Password).First();
if (passwordTest == txtPassword.Text)
{
//lblMessage.Text = "Password is correct";
// Open the Main Menu Form for Administrators
personType = "Administrator"; // sets up the main menu for administrators
personID = txtUserID.Text; // used in the changePasssword form
this.Hide(); //Hide the logon form

MainMenuForm administratorMainMenuForm = new MainMenuForm();
administratorMainMenuForm.ShowDialog();
clearFields();
this.Show(); // show the logon form when user logs off
}
else
{
lblMessage.Text = "Password is incorrect";
clearFields();
}
}
else if (loginTest == "Teacher")
{
// lookup password from Teacher file
var passwordTest = (from p in DB.Teachers
where p.TID == Int32.Parse(txtUserID.Text)
select p.Password).First();
if (passwordTest == txtPassword.Text)
{
// Open the Main Menu Form for Teachers
personType = "Teacher"; // sets up the main menu for teachers
personID = txtUserID.Text; // used in the changePasssword form
this.Hide(); //Hide the logon form
MainMenuForm teacherMainMenuForm = new MainMenuForm();
teacherMainMenuForm.ShowDialog();
clearFields();
this.Show(); // show the logon form when user logs off
}
else
{
lblMessage.Text = "Password is incorrect";
clearFields();
}
}
else
{
lblMessage.Text = "Customer ID is invalid. Please contact your Data
Administrator.";
}
}
catch (Exception)
{
lblMessage.Text = "Customer ID is invalid. Please contact your Data
Administrator.";
}
}
private void LogonForm_Load(object sender, EventArgs e)
{
lblMessage.Text = "Please enter a valid User ID and Password.rnClick Logon or press Enter
to continue.rnClick Exit to Quit.";
clearFields();
}
public void clearFields()
{
//Clear the text entry areas and prepare the login form a fresh entry
txtUserID.Clear();
txtPassword.Clear();
txtUserID.Select();
}
}
}

using System;
using System.Data;
using System.Linq;
using System.Text;
{
//Written by : Paul Smyth
//Date of last issue : 9/9/2015
//
// This form sets up the Main Menu which allows the user to
// navigate the key functions of the software.
//
// It takes the static variable personType from the logonForm
// to indicate if the user is a teacher or administrator. It
// uses this variable to switch on the menu items the user has
// access to.
//
public partial class MainMenuForm : Form
{
// Holds the user selection which will be used
// in the chosen Form selected from this menu.
// It will either be Student, Teacher or Administrator
// depending on the user choice.
public static string MenuChoice = "";
public MainMenuForm()
{
}
private void MainMenuForm_Load(object sender, EventArgs e)
{
// Update the form header
this.Text = LogonForm.personType + " Menu";
lblMainMenuMessage.Text = "Click on an option";
// Set up which button options will be available for Teacher
if (LogonForm.personType == "Teacher")
{
btnCourses.Enabled = true;
btnQualifications.Enabled = true;
btnMarks.Enabled = true;
btnTeachers.Enabled = false;
btnStudents.Enabled = false;
btnAdministrators.Enabled = false;
btnChangePassword.Enabled = true;
}
// Set up which button options will be available for Administrator
else if (LogonForm.personType == "Administrator")
{
btnCourses.Enabled = true;
btnQualifications.Enabled = true;
btnMarks.Enabled = false;
btnTeachers.Enabled = true;

btnStudents.Enabled = true;
btnAdministrators.Enabled = true;
btnChangePassword.Enabled = true;
}
}
private void btnLogoff_Click(object sender, EventArgs e)
{
// Return to the logon screen
this.Close();
}
private void btnMarks_Click(object sender, EventArgs e)
{
this.Hide(); //Hide the main menu
MarksForm marks = new MarksForm();
marks.ShowDialog();
this.Show(); // show main menu when user exits marks
}
private void btnQualifications_Click(object sender, EventArgs e)
{
QualificationsForm qualifications = new QualificationsForm();
qualifications.ShowDialog();
this.Show(); // show main menu when user exits qualifications
}
private void btnCourses_Click(object sender, EventArgs e)
{
CoursesForm courses = new CoursesForm();
courses.ShowDialog();
this.Show(); // show main menu when user exits courses
}
private void btnAdministrators_Click(object sender, EventArgs e)
{
// The StudentsForm is used for maintaining
// Student, Teacher and Administrator data
MenuChoice = "Administrator";
StudentsForm students = new StudentsForm();
students.ShowDialog();
this.Show(); // show main menu when user exits administrators
}
private void btnTeachers_Click(object sender, EventArgs e)
{
MenuChoice = "Teacher";
this.Show(); // show main menu when user exits teachers
}
private void btnStudents_Click(object sender, EventArgs e)
{

MenuChoice = "Student";
this.Show(); // show main menu when user exits students
}
private void btnChangePassword_Click(object sender, EventArgs e)
{
ChangePasswordForm password = new ChangePasswordForm();
password.ShowDialog();
this.Show(); // show main menu when user exits passwords
}
}
}

using System;
using System.Data;
using System.Data.Linq;
using System.Linq;
using System.Text;
{
//
// This form displays the required data entry mechanisms for the user
// to add, edit and delete Courses records.
// It reads and writes to the following tables with SQL TO LINQ procedures
// Course
//
//
public partial class CoursesForm : Form
{
// This bool is used to switch off a section of code that updates the
// course ID combo box in the updateData method. This item does not need
// to be refreshed after an update procedure because no course record
// has been added or deleted. The benefit of this is that the updated
// record in the Update Tab can still be displayed after the update
// process has been completed instead of the first record in the
// courses table.
bool updated = false;
public CoursesForm()
{
}
private void CoursesForm_Load(object sender, EventArgs e)
{
updateData(updated);
// Set up the initial help messages
lblCoursesMessageA.Text = "Enter the new Course details and press the Add Button";
lblCoursesMessageU.Text = "Select a Course to edit from the Course ID drop down box";
// Setup the ToolTips for this form
toolTip1.SetToolTip(btnAddA, "Add the Course Record you have entered");
toolTip1.SetToolTip(btnDeleteU, "Delete the selected record from Courses");
toolTip1.SetToolTip(btnExitA, "Return to Main Menu");
toolTip1.SetToolTip(btnExitU, "Return to Main Menu");
toolTip1.SetToolTip(btnUpdateU, "Write the updated record to Courses");
toolTip1.SetToolTip(cmbCourseIDU, "Select the Course ID to edit/delete from the drop down
list");
toolTip1.SetToolTip(cmbQualificationCodeA, "Select a Qualification Code from the drop down
list");
toolTip1.SetToolTip(cmbSemesterA, "Select a Semester from the drop down list");
toolTip1.SetToolTip(cmbSemesterU, "Select a Semester from the drop down list");
toolTip1.SetToolTip(cmbTeacherIDA, "Select a Teacher from the drop down list");
toolTip1.SetToolTip(cmbTeacherIDU, "Select a Teacher from the drop down list");
toolTip1.SetToolTip(cmbYearA, "Select a Year from the drop down list");
toolTip1.SetToolTip(cmbYearU, "Select a Year from the drop down list");

toolTip1.SetToolTip(txtCourseIDA, "Enter a unique Course ID");
toolTip1.SetToolTip(txtCourseNameA, "Enter the Course Name");
toolTip1.SetToolTip(txtCourseNameU, "Edit the Course Name");
}
// This method performs the required updates for all tables and combo
// boxes used by this form. It makes sure the correct data is displayed
// for the chosen ID
private void updateData(bool fromUpdate)
{
// Update the Course data
var courseList = (from c in DB.Courses
select c).ToList();
// Update the Course ID Combo Box
// as long as this method wasn't called by the
// update button event method.
if (fromUpdate == false)
{
cmbCourseIDU.DisplayMember = "CID";
cmbCourseIDU.ValueMember = "CID";
cmbCourseIDU.DataSource = courseList;
}
// Update the Teacher ID Combo Box display
var teachercodes = (from t in DB.Teachers
select t.TID).ToList();
cmbTeacherIDA.DisplayMember = "TID";
cmbTeacherIDA.ValueMember = "TID";
cmbTeacherIDA.DataSource = teachercodes;
// Update the Qualification Code Combo Box display
var qualificationcodes = (from q in DB.Qualifications
select q.QCode).ToList();
cmbQualificationCodeA.DisplayMember = "QCode";
cmbQualificationCodeA.ValueMember = "QCode";
cmbQualificationCodeA.DataSource = qualificationcodes;
// Reset all the Course text Fields in the Add Tab
txtCourseIDA.Clear();
txtCourseNameA.Clear();
}
// This method performs the selection process for the courses
// data when either the update screen is updated or the
// value in the courses id combo box has changed.
// It is called by the cmbCourseIDU_SelectedIndexChanged
// and btnUpdateU_Click event
internal void selectTheRecord()
{
String selectedYear; //store for the selected Year branch
string selectedSemester; //store for the selcted Semester branch
// Select the Course Record with the Course ID selected
// from the Course ID Combo Box.
var course = (from c in DB.Courses
where c.CID == Convert.ToInt32(cmbCourseIDU.Text)
select new
{
c.CName,
c.Year,

c.Semester,
c.TID
}
).First();
txtCourseNameU.Text = course.CName;
// Put the right year in the Combo Box. Either year 1
// year 2 or year 3.
selectedYear = course.Year.ToString();
switch (selectedYear)
{
case "1":
cmbYearU.SelectedIndex = 0;
break;
case "2":
break;
case "3":
break;
}
// Put the right Semester in the Combo Box
selectedSemester = course.Semester;
switch (selectedSemester)
{
case "Autumn":
cmbSemesterU.SelectedIndex = 0;
break;
case "Winter":
break;
case "Spring":
break;
}
// Update the Teacher ID Combo Box display
var teachercodes = (from t in DB.Teachers
select t.TID).ToList();
cmbTeacherIDU.DisplayMember = "TID";
cmbTeacherIDU.ValueMember = "TID";
cmbTeacherIDU.DataSource = teachercodes;
//Put the correct teacher Code in the Combo Box
int codeCount = 0;
int theCode = 0;
foreach (int code in teachercodes)
{
if (code == course.TID)
{
theCode = codeCount;
}
codeCount++;
}
cmbTeacherIDU.SelectedIndex = theCode;
// Lookup the selected teachers name and put it in the label
// adjacent to the Teacher ID combo on the form
var teacherName = (from t in DB.Persons
where t.ID == int.Parse(cmbTeacherIDU.SelectedItem.ToString())
select new

{
t.FName,
t.LName
}).First();
lblTeacherNameU.Text = teacherName.FName + " " + teacherName.LName;
}
// This method fills in the Update screen data properties based on
// the criteria set by the Course ID Combo box selection
private void cmbCourseIDU_SelectedIndexChanged(object sender, EventArgs e)
{
selectTheRecord();
}
// This section contains a series of methods that tests the data entry
// fields for both the Add and Update Tabs. Each method tests what is the
// current screen is and creates an error message if required. They are
// activated by the Add and Update Button events.
// This method tests the course number to check
// that it is valid.
// Only required for Add
private bool ValidCourseID(string courseID)
{
if (courseID == "")
{
lblCourseIDMessageA.Text = "Please enter a valid numeric course number";
return false;
}
else if (int.Parse(courseID) >= 0 & int.Parse(courseID) <= 99999)
{
lblCourseIDMessageA.Text = "";
return true;
}
else
{
lblCourseIDMessageA.Text = "Please enter a valid numeric course number";
return false;
}
}
// This method tests the course number to check that it is
// not a duplicate. Only required for Add
private bool validUniqueCourseNumber(string courseID)
{
// Lookup the existing course numbers
var coursenumbers = (from c in DB.Courses
select c.CID).ToList();
foreach (int course in coursenumbers)
{
if (course == int.Parse(courseID))
{
lblCourseIDMessageA.Text = "This course number has already been used";
return false;
}
}

lblCourseIDMessageA.Text = "";
return true;
}
// This method tests the course name to make sure that it is not blank
private bool ValidCourseName(string coursename, string tab)
{
if (coursename != "")
{
if (tab == "Add")
{
lblCourseNameMessageA.Text = "";
}
else if (tab == "Update")
{
lblCourseNameMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblCourseNameMessageA.Text = "Please enter a course name";
}
{
lblCourseNameMessageU.Text = "Please enter a course name";
}
return false;
}
}
// This method tests the year to make sure that it is not blank
private bool ValidYear(string year)
{
if (year != "")
{
lblYearMessageA.Text = "";
return true;
}
else
{
lblYearMessageA.Text = "Please select a year";
return false;
}
}
// This method tests the semester to make sure that it is not blank
private bool ValidSemester(string semester)
{
if (semester != "")
{
lblSemesterMessageA.Text = "";
return true;
}
else
{
lblSemesterMessageA.Text = "Please select a semester";
return false;
}
}

// This method updates the Course table
private void btnUpdateU_Click(object sender, EventArgs e)
{
try
{
// Indicate that this is the Update Tab for Error Message control
string theTab = "Update";
// Test that a course name has been entered
if (!ValidCourseName(txtCourseNameU.Text, theTab))
{
return;
}
// Update the Course record in the Courses Table
where c.CID == Convert.ToInt32(cmbCourseIDU.Text)
select c).First();
courseList.CName = txtCourseNameU.Text.Trim();
courseList.Year = (int)int.Parse(cmbYearU.SelectedItem.ToString());
courseList.Semester = cmbSemesterU.SelectedItem.ToString();
courseList.TID = (int)cmbTeacherIDU.SelectedItem;
// Save the changes that were made
DB.SubmitChanges();
// Refresh the Bound controls
DB.Refresh(RefreshMode.OverwriteCurrentValues, DB.Courses);
lblCoursesMessageU.Text = "Course ID " + cmbCourseIDU.Text + " has been updated";
updated = true;
selectTheRecord();
updated = false;
}
catch (Exception Ex)
{
MessageBox.Show(Ex.Message);
}
}
// This method adds data to the Courses table
private void btnAddA_Click(object sender, EventArgs e)
{
try
{
// Indicate that this is the Add Tab for Error Message control
string theTab = "Add";
// Test that a valid course number has been entered
if (!ValidCourseID(txtCourseIDA.Text))
{
return;
}
// Test that a unique Course number has been entered
if (!validUniqueCourseNumber(txtCourseIDA.Text))
{
return;
}

// Test that a course name has been entered
if (!ValidCourseName(txtCourseNameA.Text, theTab))
{
return;
}
// Test that a year has been selected
if (!ValidYear(cmbYearA.Text))
{
return;
}
// Test that a semester has been selected
if (!ValidSemester(cmbSemesterA.Text))
{
return;
}
// Create a new Courses object and add its properties
var newCourse = new Course();
newCourse.CID = int.Parse(txtCourseIDA.Text.ToString());
newCourse.CName = txtCourseNameA.Text.Trim();
newCourse.Year = int.Parse(cmbYearA.SelectedItem.ToString());
newCourse.Semester = cmbSemesterA.SelectedItem.ToString();
newCourse.TID = int.Parse(cmbTeacherIDA.SelectedItem.ToString());
// Add the new course to the database
DB.Courses.InsertOnSubmit(newCourse);
DB.SubmitChanges();
// Create a new Qualification_Courses object and
// add its properties
var newQualCourse = new Qualification_Course();
newQualCourse.QCode = cmbQualificationCodeA.SelectedItem.ToString();
newQualCourse.CID = int.Parse(txtCourseIDA.Text.ToString());
// Add the new record to the database
DB.Qualification_Courses.InsertOnSubmit(newQualCourse);
DB.SubmitChanges();
lblCoursesMessageA.Text = "Course ID " + txtCourseIDA.Text + " added";
}
{
}
}
// This method deletes the selected rcord in the update screen
// from the Courses table.
private void btnDeleteU_Click(object sender, EventArgs e)
{
try
{
// Get the course that matches the criteria in the course ID
// combo box
var deletedCourse = (from c in DB.Courses
where c.CID == (int)cmbCourseIDU.SelectedValue
select c).First();

DialogResult d = MessageBox.Show("Are you sure you want to delete this Course?",
"Confirm Deletion", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
if (d == DialogResult.Yes)
{
DB.Courses.DeleteOnSubmit(deletedCourse);
DB.SubmitChanges();
MessageBox.Show("Course deleted");
}
else if (d == DialogResult.No)
{
MessageBox.Show("Delete operation cancelled");
}
}
{
}
}
//Lookup the selected teachers name and put it in the adjacent label
//in the Update form
private void cmbTeacherIDU_SelectedIndexChanged(object sender, EventArgs e)
{
where t.ID == int.Parse(cmbTeacherIDU.SelectedItem.ToString())
select new
{
t.FName,
t.LName
}).First();
lblTeacherNameU.Text = teacherName.FName + " " + teacherName.LName;
}
// Lookup the selected teachers name and put it in the adjacent label
// in the Add form
private void cmbTeacherIDA_SelectedIndexChanged(object sender, EventArgs e)
{
where t.ID == int.Parse(cmbTeacherIDA.SelectedItem.ToString())
select new
{
t.FName,
t.LName
}).First();
lblTeacherNameA.Text = teacherName.FName + " " + teacherName.LName;
}
// Lookup the selected qualification name and put it in the adjacent
// label in the Add form
private void cmbQualificationCodeA_SelectedIndexChanged(object sender, EventArgs e)
{
var qualificationName = (from q in DB.Qualifications
where q.QCode == cmbQualificationCodeA.Text
select q.QName).First();

lblQualificationNameA.Text = qualificationName;
}
// This method exits from the Add screen
private void btnExitA_Click(object sender, EventArgs e)
{
DialogResult = System.Windows.Forms.DialogResult.No;
}
// This method exits from the Update screen
private void btnExitU_Click(object sender, EventArgs e)
{
}
}
}

using System;
using System.Data;
using System.Linq;
using System.Text;
{
public partial class MarksForm : Form
{
public MarksForm()
{
}
// This is what happens when the form is first loaded
private void MarksForm_Load(object sender, EventArgs e)
{
var studentList = (from s in DB.Persons
where s.Type == "Student"
select new { s.ID, s.FName, s.LName }
).ToList();
cmbStudentIDS.DisplayMember = "ID";
cmbStudentIDS.ValueMember = "ID";
cmbStudentIDS.DataSource = studentList;
select new { c.CID, c.CName }
).ToList();
cmbCourseIDC.DisplayMember = "CID";
cmbCourseIDC.ValueMember = "CID";
cmbCourseIDC.DataSource = courseList;
// Switch off the add student course panel
// It will be switched on when the user clicks the
// Add Course button in the view by students tab.
pnlAddStudentS.Visible = false;
// Put the default tab header in place
tabStudent.Text = "View Marks by Student";
// Set up the ToolTips for this form
toolTip1.SetToolTip(btnAddStudentS, "Click here to go to the Add Record Screen");
toolTip1.SetToolTip(btnDeleteS, "Click here to delete the selected record in the Grid");
toolTip1.SetToolTip(btnExitC, "Click here to return to the Main Menu");
toolTip1.SetToolTip(btnExitS, "Click here to return to the Main Menu");
toolTip1.SetToolTip(btnPanelAddStudentS, "Click here to save the Record");
toolTip1.SetToolTip(btnPanelCancelS, "Click here to cancel the edit. The Record will not be
added");
toolTip1.SetToolTip(btnPanelUpdateStudentS, "Click here to update the Record");
toolTip1.SetToolTip(btnUpdateS, "Click here to go to the Update Screen for the selected
record in the Grid");
toolTip1.SetToolTip(cmbPanelCourseIDS, "Select a Course ID from the drop down list");
toolTip1.SetToolTip(cmbCourseIDC, "Select a Course ID from the drop down list");
toolTip1.SetToolTip(cmbStudentIDS, "Select a Student ID from the drop down list");

toolTip1.SetToolTip(txtPanelMarkS, "Enter a mark between 0 and 100 (decimal values are not
permitted)");
lblMarksByStudentsMessage.Text = "Click on a record to select it to update or delete it";
}
// This method fills in the Marks by Course screen data properties based on
// the criteria set by the Course ID Combo box selection
private void cmbCourseIDC_SelectedIndexChanged(object sender, EventArgs e)
{
selectTheCourse();
}
// This method runs the script called by cmbCourseIDC_SelectedIndexChanged
// event. It is seperated because it is also called by the
// btnPanelAddStudentS_Click to make sure that the latest course
// information is displayed in the courses dgv after a student
// course record has been added.
internal void selectTheCourse()
{
// Reset the datagrid before performing the query
// because this method seems to append new columns
// to the datagrid when it is run.
dgvMarksC.DataSource = null;
dgvMarksC.Columns.Clear();
dgvMarksC.Rows.Clear();
// Select the Courses Marks with the Course ID
// selected in the Course ID Combo Box
var marksByCourseList = (from c in DB.Student_Courses
join p in DB.Persons
on c.SID equals p.ID
where c.CID == Convert.ToInt32(cmbCourseIDC.Text)
select new { c.SID, p.FName, p.LName, c.Mark }
).ToList();
dgvMarksC.DataSource = marksByCourseList;
// Setup the by course datagrid
dgvMarksC.Columns[0].HeaderText = "ID";
dgvMarksC.Columns[0].Width = 60;
dgvMarksC.Columns[0].ReadOnly = true;
dgvMarksC.Columns[1].HeaderText = "First Name";
dgvMarksC.Columns[2].HeaderText = "Last Name";
dgvMarksC.Columns[3].HeaderText = "Mark";
// Get the Course name for the selected Course ID
// displayed in the Combo Box
var courseName = (from n in DB.Courses
where n.CID == Convert.ToInt32(cmbCourseIDC.Text)
select n.CName).First();
lblCourseNameC.Text = courseName;
}
// This method deletes a record from the student view datagrid
private void btnDeleteS_Click(object sender, EventArgs e)
{

try
{
// Make the selected row go a different colour.
dgvMarksS.CurrentRow.DefaultCellStyle.BackColor = Color.Red;
DialogResult d = MessageBox.Show("Are you sure you want to delete this record?",
{
// Pick the criteria from the chosen row in the datagrid
int rowSelected = dgvMarksS.CurrentCell.RowIndex;
int deleteStudentID = Convert.ToInt32(cmbStudentIDS.Text);
int deleteCourseID =
int.Parse(dgvMarksS.Rows[rowSelected].Cells[0].Value.ToString());
// Get the record that matches the criteria
var deleteStudentCourse = (from s in DB.Student_Courses
where s.SID == deleteStudentID
&& s.CID == deleteCourseID
select s).First();
DB.Student_Courses.DeleteOnSubmit(deleteStudentCourse);
DB.SubmitChanges();
lblMarksByStudentsMessage.Text = "Course Record deleted";
dgvMarksS.CurrentRow.DefaultCellStyle.BackColor = Color.White;
// This method call makes sure that the course
// tab details have been updated.
selectTheCourse();
// Update the Marks by student screen
updateMarksByStudent();
}
{
lblMarksByStudentsMessage.Text = "Delete operation cancelled";
dgvMarksS.CurrentRow.DefaultCellStyle.BackColor = Color.White;
return;
}
else
{
throw new NotSupportedException();
}
}
{
}
}
// This method fills in the Marks by Student screen data properties based on
// the criteria set by the Student ID Combo box selection
private void cmbStudentIDS_SelectedIndexChanged(object sender, EventArgs e)
{
updateMarksByStudent();
}
internal void updateMarksByStudent()
{
// Change the Tab header
tabStudent.Text = "View Marks by Student";

// Reset the data grid before running the query
// because this method seems to append new columns
// to the datagrid when it is run.
dgvMarksS.DataSource = null;
dgvMarksS.Columns.Clear();
dgvMarksS.Rows.Clear();
// Select the Courses Marks with the student ID
// selected i n the Course ID Combo Box
var marksByStudentList = (from s in DB.Student_Courses
join c in DB.Courses
on s.CID equals c.CID
where s.SID == Convert.ToInt32(cmbStudentIDS.Text)
select new { s.CID, c.CName, s.Mark }
).ToList();
dgvMarksS.DataSource = marksByStudentList;
// Set up the by students Datagrid
dgvMarksS.Columns[0].HeaderText = "ID";
dgvMarksS.Columns[0].Width = 60;
dgvMarksS.Columns[0].ReadOnly = true;
dgvMarksS.Columns[1].HeaderText = "Course Name";
dgvMarksS.Columns[1].ReadOnly = true;
dgvMarksS.Columns[2].HeaderText = "Mark";
// Get the Student name for the selected Student ID
// displayed in the Combo Box
var studentName = (from n in DB.Persons
where n.ID == Convert.ToInt32(cmbStudentIDS.Text)
select new { n.FName, n.LName }
).First();
lblStudentNameS.Text = studentName.FName + " " + studentName.LName;
}
// This method presents the Add Student Course panel and fills
// the required data ready for data entry.
private void btnAddStudentS_Click(object sender, EventArgs e)
{
string editing = "Add";
tabStudent.Text = "Add a Student Course / Mark"; //Change the Tab Header
displayTheEditPanel(editing);
}
private void btnUpdateS_Click(object sender, EventArgs e)
{
string editing = "Update";
tabStudent.Text = "Update a Student Mark";
displayTheEditPanel(editing);
}
internal void displayTheEditPanel(string edited)
{
pnlAddStudentS.Visible = true;
pnlCourseIDOverlayS.Visible = false;
pnlUpdateRecordBtnS.Visible = false;
if (edited == "Add")
{

txtPanelMarkS.Text = "0"; // default value displayed
// Update the Course ID Combo Box
cmbPanelCourseIDS.DisplayMember = "CID";
cmbPanelCourseIDS.ValueMember = "CID";
cmbPanelCourseIDS.DataSource = courseList;
}
else if (edited == "Update")
{
// Cover up the Course ID Combo box with a Course ID label.
// The combo box is not required in Update.
pnlCourseIDOverlayS.Visible = true;
pnlUpdateRecordBtnS.Visible = true;
int rowSelected = dgvMarksS.CurrentCell.RowIndex;
txtPanelOverlayCourseIDS.Text = dgvMarksS.Rows[rowSelected].Cells[0].Value.ToString();
txtPanelMarkS.Text = dgvMarksS.Rows[rowSelected].Cells[2].Value.ToString();
// Get the Course Name for the panel
where n.CID == int.Parse(txtPanelOverlayCourseIDS.Text)
lblPanelCourseNameS.Text = courseName;
}
txtPanelStudentIDS.Text = cmbStudentIDS.Text;
lblPanelStudentNameS.Text = lblStudentNameS.Text;
}
// This method selects the course name in the Add Student Course panel
// when the Course ID combo box value changes
private void cmbPanelCourseIDS_SelectedIndexChanged(object sender, EventArgs e)
{
//Get the Course Name
where n.CID == int.Parse(cmbPanelCourseIDS.SelectedItem.ToString())
lblPanelCourseNameS.Text = courseName;
}
// This method updates the Student Course table with the data
// that was entered on the add student course panel. It also
// puts the Student ID that was selected for editing back into
// the Student ID combo box.
private void btnPanelAddStudentS_Click(object sender, EventArgs e)
{
string editing = "Add";
addOrUpdateMark(editing);
}
private void btnPanelUpdateStudentS_Click(object sender, EventArgs e)
{
string editing = "Update";
addOrUpdateMark(editing);
}
// This method is the guts of the Add / Update procedure called
// by btnPanelAddStudentS_Click or btnPanelUpdateStudentS_Click
// button event.
internal void addOrUpdateMark(string edited)

{
try
{
// Test the Mark value to see if it is a numeric
// and not a string or decimal
if (!validMarkIsNumber(txtPanelMarkS.Text))
{
return;
}
// Test the Mark value to see if it is between 0 and 99
if (!validMarkInRange(txtPanelMarkS.Text))
{
return;
}
{
// Test that the course ID has not already been selected for this student
if (!validUniqueCourseNumber(cmbPanelCourseIDS.SelectedItem.ToString()))
{
return;
}
// Write to the student courses table.
var newStudentCourse = new Student_Course();
newStudentCourse.SID = int.Parse(txtPanelStudentIDS.Text);
newStudentCourse.CID = int.Parse(cmbPanelCourseIDS.SelectedItem.ToString());
newStudentCourse.Mark = int.Parse(txtPanelMarkS.Text);
//
DB.Student_Courses.InsertOnSubmit(newStudentCourse);
DB.SubmitChanges();
}
{
var updateStudentCourse = (from u in DB.Student_Courses
where u.SID == int.Parse(txtPanelStudentIDS.Text)
&& u.CID == int.Parse(txtPanelOverlayCourseIDS.Text)
select u).First();
updateStudentCourse.Mark = int.Parse(txtPanelMarkS.Text);
DB.SubmitChanges();
// Refresh the bound controls
DB.Refresh(RefreshMode.OverwriteCurrentValues, DB.Student_Courses);
}
//Put the existing Student ID back in the Student Combo Box
var studentListPanel = (from s in DB.Persons
where s.Type == "Student"
select s.ID).ToList();
cmbStudentIDS.DisplayMember = "ID";
cmbStudentIDS.ValueMember = "ID";
cmbStudentIDS.DataSource = studentListPanel;
int codeCount = 0;
int theCode = 0;
foreach (int id in studentListPanel)
{
if (id == int.Parse(txtPanelStudentIDS.Text))

{
}
codeCount++;
}
cmbStudentIDS.SelectedIndex = theCode;
// This method call makes sure that the course
// tab details have been updated.
selectTheCourse();
// Switch off the Add Student Course panel
{
lblMarksByStudentsMessage.Text = "Student Course details added";
}
{
lblMarksByStudentsMessage.Text = "Student Course mark updated";
}
tabStudent.Text = "View Marks by Student"; //Change the Tab Header
}
{
}
}
// This method checks to see if the mark is an actual integer
private bool validMarkIsNumber(string markToCheck)
{
int number;
bool result = Int32.TryParse(markToCheck, out number);
if (result)
{
lblPanelMarkMessageS.Text = "";
return true;
}
else
{
lblPanelMarkMessageS.Text = "Enter a whole number between 0 and 100";
return false;
}
}
// This method checks to see if the mark number is between 0 and 100
private bool validMarkInRange(string markToCheck)
{
if (int.Parse(markToCheck) >= 0 && int.Parse(markToCheck) <= 100)
{
lblPanelMarkMessageS.Text = "";
return true;
}
else
{
lblPanelMarkMessageS.Text = "Enter a whole number between 0 and 100";
return false;
}
}

// This method checks to see if the course number hasn't already
// been seleceted for the selected student.
private bool validUniqueCourseNumber(string courseID)
{
// Get the list of courses for the student
var coursenumbers = (from c in DB.Student_Courses
where c.SID == Convert.ToInt32(txtPanelStudentIDS.Text)
// See if the selected course is on the list.
foreach (int course in coursenumbers)
{
if (course == int.Parse(courseID))
{
//lblPanelCourseNameS.ForeColor = 192, 0, 0; ??
lblPanelCourseNameS.Text = "This course number is already used by the student";
return false;
}
}
return true;
}
private void btnPanelCancelS_Click(object sender, EventArgs e)
{
tabStudent.Text = "View Marks by Student"; //Change the Tab Header
lblMarksByStudentsMessage.Text = "Add/Edit function cancelled";
}
// This method exits the Marks by Student Screen
private void btnExitS_Click(object sender, EventArgs e)
{
}
// This method exits the Marks by Course Screen
private void btnExitC_Click(object sender, EventArgs e)
{
}
}
}

using System;
using System.Data;
using System.Linq;
using System.Text;
{
//
// to add, edit and delete Qualification records.
// Qualification
// Qualification_Courses
//
// There is an extra tab on this form which displays 2 datagrids.
// This tab screen is used to add or delete courses to qualifications.
// The user clicks the record to add or delete and then clicks the
// Add or Delete button to perform that action. A panel with basic
// instructions can be called up by clicking a Help button on that tab.
public partial class QualificationsForm : Form
{
// qualification ID combo box in the updateData method. This item does not need
// courses table.
public QualificationsForm()
{
}
private void QualificationsForm_Load(object sender, EventArgs e)
{
pnlHelpC.Visible = false; // Make sure the Help panel is closed.
// Load Course data into the available courses dataset view
// in the Add Delete Courses Tab
select new { c.CID, c.CName }
).ToList();
dgvAvailableCoursesC.DataSource = courseList;
dgvAvailableCoursesC.Columns[0].HeaderText = "ID";
dgvAvailableCoursesC.Columns[0].Width = 40;
dgvAvailableCoursesC.Columns[1].HeaderText = "Name";
dgvAvailableCoursesC.Columns[1].Width = 152;

// Setup the ToolTips for this form
toolTip1.SetToolTip(btnAddA, "Add the Qualification Record you have entered");
toolTip1.SetToolTip(btnAddC, "Add the Course you have selected in Available Courses
Table");
toolTip1.SetToolTip(btnDeleteC, "Delete the Course you have selected in Courses Table");
toolTip1.SetToolTip(btnDeleteU, "Delete the selected record from Qualifications");
toolTip1.SetToolTip(btnExitC, "Return to Main Menu");
toolTip1.SetToolTip(btnUpdateU, "Write the updated record to Qualifications");
toolTip1.SetToolTip(cmbDurationA, "Select the duration period for this qualification from
the drop down list");
toolTip1.SetToolTip(cmbQualificationIDC, "Select the Qualification you wish to inspect from
the drop down list");
toolTip1.SetToolTip(cmbQualificationIDU, "Select the Qualification you wish to
update/delete from the drop down list");
toolTip1.SetToolTip(txtQualificationIDA, "Enter a unique Qualification ID");
toolTip1.SetToolTip(txtQualificationNameA, "Enter the Qualification Name");
toolTip1.SetToolTip(txtQualificationNameU, "Change the Qualification Name");
}
//This method performs the required updates for all tables and combo
//boxes used by this form.
private void updateData(bool fromUpdate)
{
// Update the Qualification data
var qualList = (from q in DB.Qualifications
select q).ToList();
// Update the Qualification ID Combo Box
{
cmbQualificationIDU.DisplayMember = "QCode";
cmbQualificationIDU.ValueMember = "QCode";
cmbQualificationIDU.DataSource = qualList;
}
// Update the Qualification/Course data
var qualCourseList = (from c in DB.Qualification_Courses
select c).ToList();
//Update the Qualification/Course ID Combo Box
cmbQualificationIDC.DisplayMember = "QCode";
cmbQualificationIDC.ValueMember = "QCode";
cmbQualificationIDC.DataSource = qualList;
// Clear the Text fields on the Add Tab
txtQualificationIDA.Clear();
txtQualificationNameA.Clear();
}
// the criteria set by the Qualification ID Combo box selection by using
// the selectTheRecord method. selectTheRecord method is also called by the
// btnUpdateU_Click event
private void cmbQualificationIDU_SelectedIndexChanged(object sender, EventArgs e)
{
selectTheRecord();

}
// This method ensures that the correct data is displayed after an update
// has been performed or the user has selected a different Qualification ID
// in the update screen. It is called by the cmbQualificationIDU_SelectedIndexChanged
{
string selectedDuration; // Store for the selected Duration branch
// Select the Qualification record with the Qualification ID
// selected from the Qualification ID Combo Box
var qualification = (from q in DB.Qualifications
where q.QCode == cmbQualificationIDU.Text
select q).First();
txtQualificationNameU.Text = qualification.QName;
// Put the right duration in the Combo Box
selectedDuration = qualification.Duration.ToString();
switch (selectedDuration)
{
case "1 month":
cmbDurationU.SelectedIndex = 0;
break;
case "2 months":
break;
case "3 months":
break;
case "4 months":
break;
case "5 months":
break;
case "6 months":
break;
case "7 months":
break;
case "8 months":
break;
case "9 months":
break;
case "10 months":
break;
case "11 months":
break;
case "12 months":
break;
}
}

// This method tests the qualification ID
// to make sure that it is not blank.
// Only required for ADD
private bool ValidQualificationID(string qualificationID)
{
if (qualificationID != "")
{
lblQualificationIDMessageA.Text = "";
return true;
}
else
{
lblQualificationIDMessageA.Text = "Please enter a valid qualification ID";
return false;
}
}
// This method tests the qualification name to make sure that it is not blank
private bool ValidQualificationName(string qualificationname, string tab)
{
if (qualificationname != "")
{
if (tab == "Add")
{
lblQualificationNameMessageA.Text = "";
}
{
lblQualificationNameMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblQualificationNameMessageA.Text = "Please enter a qualification name";
}
{
lblQualificationNameMessageU.Text = "Please enter a qualification name";
}
return false;
}
}
// This method tests the duration entry
// to make sure that it is not blank.
// Only required for ADD
private bool ValidDuration(string duration)
{
if (duration != "")
{
lblDurationMessageA.Text = "";
return true;
}
else
{
lblDurationMessageA.Text = "Please enter a valid duration ID";

return false;
}
}
// This method updates the Qualification table
{
try
{
// Test that the qualification name has been entered
if (!ValidQualificationName(txtQualificationNameU.Text, theTab))
{
return;
}
// Update the selected record in the Qualifications table
var qualification = (from q in DB.Qualifications
select q).First();
qualification.QName = txtQualificationNameU.Text;
qualification.Duration = cmbDurationU.SelectedItem.ToString();
DB.SubmitChanges();
// Refresh the Bound Controls
DB.Refresh(RefreshMode.OverwriteCurrentValues, DB.Qualifications);
MessageBox.Show("Qualification Code " + qualification.QCode + " updated");
updated = true;
selectTheRecord();
updated = false;
}
{
}
}
// This method verifies the data added in the Add screen
// and then writes the data to the Qualifications table.
{
try
{
// Test that the qualification ID has been entered
if (!ValidQualificationID(txtQualificationIDA.Text))
{
return;
}
// Test that the qualification name has been entered
if (!ValidQualificationName(txtQualificationNameA.Text, theTab))
{

return;
}
// Test that the duration has been selected
if (!ValidDuration(cmbDurationA.Text))
{
return;
}
// Create a new Qualifications object and add its properties
var newQualification = new Qualification();
newQualification.QCode = txtQualificationIDA.Text.Trim();
newQualification.QName = txtQualificationNameA.Text.Trim();
newQualification.Duration = cmbDurationA.SelectedItem.ToString();
// Add the new Qualification to the database
DB.Qualifications.InsertOnSubmit(newQualification);
DB.SubmitChanges();
MessageBox.Show("Qualification " + newQualification.QCode + " added");
}
catch(Exception Ex)
{
}
}
// This method deletes the selected Qualification listed in
// the Combo box from the Qualification Table. It also
// deletes the associated Qualification_Course table records too.
{
try
{
var deletedQualification = (from q in DB.Qualifications
select q).First();
var deletedQualificationCourse = (from c in DB.Qualification_Courses
where c.QCode == cmbQualificationIDU.Text
select c).ToList();
DialogResult d = MessageBox.Show("Are you sure you want to delete this Qualification?",
{
DB.Qualifications.DeleteOnSubmit(deletedQualification);
DB.Qualification_Courses.DeleteAllOnSubmit(deletedQualificationCourse);
DB.SubmitChanges();
MessageBox.Show("Qualification deleted");
}
{
}
}

{
}
}
// This method selects The Qualification/Course data to display based
// on what is selected in the Qualification ID Combo Box. It also
// Looks up the Qualification name for the selected qualification.
// The Available Courses datagrid is updated by the UpdateData method
private void cmbQualificationIDC_SelectedIndexChanged(object sender, EventArgs e)
{
var qualCourseList = (from q in DB.Qualification_Courses
join c in DB.Courses
on q.CID equals c.CID
where q.QCode == cmbQualificationIDC.Text
select new { q.CID, c.CName }
).ToList();
dgvCoursesC.DataSource = qualCourseList;
dgvCoursesC.Columns[0].HeaderText = "ID";
dgvCoursesC.Columns[0].Width =40;
dgvCoursesC.Columns[1].HeaderText = "Name";
dgvCoursesC.Columns[1].Width = 152;
var qualName = (from n in DB.Qualifications
where n.QCode == cmbQualificationIDC.Text
select n.QName).First();
lblQualificationNameC.Text = qualName;
}
// This method copies the selected record from the available courses datagrid
// and copies it to the qualification courses table. Then it updates the
// qualification courses datagrid.
private void btnAddC_Click(object sender, EventArgs e)
{
try
{
// Store the current selected Combo value so that it
// can be selected after the process is finished.
var theQualificationID = cmbQualificationIDC.SelectedIndex;
//Select the selected Course ID from the Course datagrid
int rowSelected = dgvAvailableCoursesC.CurrentCell.RowIndex;
var selectedCourseIDNumber =
dgvAvailableCoursesC.Rows[rowSelected].Cells[0].Value.ToString();
// Check that it is not already been added to the
// selected Qualification
var cidList = (from q in DB.Qualification_Courses
where q.QCode == cmbQualificationIDC.Text
select q.CID).ToList();
foreach (int c in cidList)
{
if (c == int.Parse(selectedCourseIDNumber))
{
MessageBox.Show("The selected course has already been added");
return;
}
}

// Use the selected Qualification Code and Course ID to
// create a new Qualification_Course record
var newQualificationCourse = new Qualification_Course();
newQualificationCourse.QCode = cmbQualificationIDC.SelectedValue.ToString();
newQualificationCourse.CID = int.Parse(selectedCourseIDNumber);
DB.Qualification_Courses.InsertOnSubmit(newQualificationCourse);
DB.SubmitChanges();
MessageBox.Show("Course added to Qualification");
// Recall the selected combo value
cmbQualificationIDC.SelectedIndex = theQualificationID;
}
{
}
}
// This method will delete the selected record in the
// Qualification_Course datagrid
private void btnDeleteC_Click(object sender, EventArgs e)
{
try
{
// Store the current selected Combo value so that it
// can be selected after the process is finished.
var theQualificationID = cmbQualificationIDC.SelectedIndex;
// Identify the Qualification_Course record to delete
// from the datagrid.
int rowSelected = dgvCoursesC.CurrentCell.RowIndex;
var selectedCID = dgvCoursesC.Rows[rowSelected].Cells[0].Value;
var deletedQualificationCourse = (from c in DB.Qualification_Courses
where c.QCode == cmbQualificationIDU.Text
&& c.CID == (int) selectedCID
select c).First();
DialogResult d = MessageBox.Show("Are you sure you want to delete this Qualification?",
{
DB.Qualification_Courses.DeleteOnSubmit(deletedQualificationCourse);
DB.SubmitChanges();
// Recall the selected combo value
cmbQualificationIDC.SelectedIndex = theQualificationID;
MessageBox.Show("Qualification Course deleted");
}
{
}

}
{
}
}
{
}
{
}
// This method exits from the Change Courses screen
private void btnExitC_Click(object sender, EventArgs e)
{
}
// Close the Help Panel
private void btnCloseHelpC_Click(object sender, EventArgs e)
{
pnlHelpC.Visible = false;
}
// Open the Help Panel
private void btnHelpC_Click(object sender, EventArgs e)
{
pnlHelpC.Visible = true;
}
}
}

using System;
using System.Data;
using System.Linq;
using System.Text;
{
//
// to add, edit and delete student, teacher and administrator records.
// Person
// Teacher
// Student
// Administration
//
// NOTE
//Even though this form is called StudentsForm, it also includes
//code to operate the requirements for the Teacher and
//Administrator forms too. This version was neccessary to
//reduce the code duplication that resulted from running
//three very similar forms.
public partial class StudentsForm : Form
{
// Person ID combo box in the updateData method. This item does not need
// courses table.
public StudentsForm()
{
}
private void StudentsForm_Load(object sender, EventArgs e)
{
// Update the form header
this.Text = MainMenuForm.MenuChoice + " Form";
// Set up the initial help messages
lblAddMessage.Text = "Enter the new " + MainMenuForm.MenuChoice + " details and press the
Add Button";
lblUpdateMessage.Text = "Select a " + MainMenuForm.MenuChoice + " ID to edit from the
Course ID drop down box";
UpdateData(updated); // resets the fields and combo boxes

// Setup the form according to what menu option was selected.
// The fields relating to person will stay the same on the form
// and extra fields will be added for the required student,
// teacher or administrator option.
if (MainMenuForm.MenuChoice == "Student")
{
lblQNameA.Enabled = true;
lblQNameU.Enabled = true;
lblQualificationCodeA.Enabled = true;
lblQualificationCodeU.Enabled = true;
cmbQualificationCodeA.Enabled = true;
cmbQualificationCodeU.Enabled = true;
lblStartDateA.Enabled = true;
lblStartDateU.Enabled = true;
dtpStartDateA.Enabled = true;
dtpStartDateU.Enabled = true;
lblTeacherRegA.Enabled = false;
lblTeacherRegU.Enabled = false;
lblTeacherRegMessageA.Enabled = false;
lblTeacherRegMessageU.Enabled = false;
txtTeacherRegA.Enabled = false;
txtTeacherRegU.Enabled = false;
lblAdminRoleA.Enabled = false;
lblAdminRoleU.Enabled = false;
lblAdminRoleMessageA.Enabled = false;
lblAdminRoleMessageU.Enabled = false;
txtAdminRoleA.Enabled = false;
txtAdminRoleU.Enabled = false;
}
else if (MainMenuForm.MenuChoice == "Teacher")
{
lblQNameA.Enabled = false;
lblQNameU.Enabled = false;
lblQualificationCodeA.Enabled = false;
lblQualificationCodeU.Enabled = false;
cmbQualificationCodeA.Enabled = false;
cmbQualificationCodeU.Enabled = false;
lblStartDateA.Enabled = false;
lblStartDateU.Enabled = false;
dtpStartDateA.Enabled = false;
dtpStartDateU.Enabled = false;
lblTeacherRegA.Enabled = true;
lblTeacherRegU.Enabled = true;
lblTeacherRegMessageA.Enabled = true;
lblTeacherRegMessageU.Enabled = true;
txtTeacherRegA.Enabled = true;
txtTeacherRegU.Enabled = true;
lblAdminRoleA.Enabled = false;
lblAdminRoleU.Enabled = false;
lblAdminRoleMessageA.Enabled = false;
lblAdminRoleMessageU.Enabled = false;
txtAdminRoleA.Enabled = false;
txtAdminRoleU.Enabled = false;
}
else if (MainMenuForm.MenuChoice == "Administrator")
{
lblQNameA.Enabled = false;
lblQNameU.Enabled = false;
lblQualificationCodeA.Enabled = false;
lblQualificationCodeU.Enabled = false;
cmbQualificationCodeA.Enabled = false;
cmbQualificationCodeU.Enabled = false;

lblStartDateA.Enabled = false;
lblStartDateU.Enabled = false;
dtpStartDateA.Enabled = false;
dtpStartDateU.Enabled = false;
lblTeacherRegA.Enabled = false;
lblTeacherRegU.Enabled = false;
lblTeacherRegMessageA.Enabled = false;
lblTeacherRegMessageU.Enabled = false;
txtTeacherRegA.Enabled = false;
txtTeacherRegU.Enabled = false;
lblAdminRoleA.Enabled = true;
lblAdminRoleU.Enabled = true;
lblAdminRoleMessageA.Enabled = true;
lblAdminRoleMessageU.Enabled = true;
txtAdminRoleA.Enabled = true;
txtAdminRoleU.Enabled = true;
}
else
{
}
// Setup thetooltips for ths form
toolTip1.SetToolTip(btnAddA, "Add the " + MainMenuForm.MenuChoice + " Record you have
entered");
toolTip1.SetToolTip(btnDeleteU, "Delete the selected record from " +
MainMenuForm.MenuChoice + "s");
toolTip1.SetToolTip(btnUpdateU, "Update the " + MainMenuForm.MenuChoice + " Record you have
entered");
toolTip1.SetToolTip(cmbPersonIDU, "Select the "+ MainMenuForm.MenuChoice + " ID to
edit/delete from the drop down list");
toolTip1.SetToolTip(cmbQualificationCodeA, "Select a Qualification Code from the drop down
list");
toolTip1.SetToolTip(cmbQualificationCodeU, "Select a Qualification Code from the drop down
list");
toolTip1.SetToolTip(cmbStateA, "Select a State from the drop down list");
toolTip1.SetToolTip(cmbStateU, "Select a State from the drop down list");
toolTip1.SetToolTip(txtAddress1A, "Input the first line of the Address. This is required");
toolTip1.SetToolTip(txtAddress1U, "Input the first line of the Address. This is required");
toolTip1.SetToolTip(txtAddress2A, "Input the second line of the Address. This is
optional");
toolTip1.SetToolTip(txtAddress2U, "Input the second line of the Address. This is
optional");
toolTip1.SetToolTip(txtPhoneA, "Input a phone number. Either a mobile number or a land line
number with the correct area code for the state. This is required");
toolTip1.SetToolTip(txtPhoneU, "Input a phone number. Either a mobile number or a land line
number with the correct area code for the state. This is required");
toolTip1.SetToolTip(txtPostcodeA, "Input the Postcode. This is required");
toolTip1.SetToolTip(txtPostcodeU, "Input the Postcode. This is required");
toolTip1.SetToolTip(txtSuburbA, "Input the Suburb. This is required");
toolTip1.SetToolTip(txtSuburbU, "Input the Suburb. This is required");
toolTip1.SetToolTip(txtTeacherRegA, "Input the Teacher Registration. This is required");
toolTip1.SetToolTip(txtTeacherRegU, "Input the Teacher Registration. This is required");
toolTip1.SetToolTip(txtFirstNameA, "Input the First Name. This is required");
toolTip1.SetToolTip(txtFirstNameU, "Input the First Name. This is required");
toolTip1.SetToolTip(txtLastNameA, "Input the Last Name. This is required");
toolTip1.SetToolTip(txtLastNameU, "Input the Last Name. This is required");
toolTip1.SetToolTip(dtpDateOfBirthA, "Select the Date of Birth");
toolTip1.SetToolTip(dtpDateOfBirthU, "Select the Date of Birth");
toolTip1.SetToolTip(dtpStartDateA, "Select the Student's Start Date");
toolTip1.SetToolTip(dtpStartDateU, "Select the Student's Start Date");
}

// This method performs the required screen updates for all text and combo
// boxes used by this form. It is called by the btnAddA_Click
private void UpdateData(bool fromUpdate)
{
{
// Select the Student record from the Person & Student database
var personList = (from p in DB.Persons
join s in DB.Students
on p.ID equals s.SID
select new
{
p.ID,
p.FName,
p.LName,
p.DOB,
p.Phone,
p.Add1,
p.Add2,
p.Suburb,
p.State,
p.Postcode,
s.Sdate,
s.QCode
}
).ToList();
// Update the Person ID combo box data
{
cmbPersonIDU.DisplayMember = "ID";
cmbPersonIDU.ValueMember = "ID";
cmbPersonIDU.DataSource = personList;
}
var qualcodes = (from q in DB.Qualifications
cmbQualificationCodeA.DisplayMember = "QCode";
cmbQualificationCodeA.ValueMember = "QCode";
cmbQualificationCodeA.DataSource = qualcodes;
// Reset the Student start date to todays date
// on the Add Tab
dtpStartDateA.Value = DateTime.Today;
}
{
// Select the teacher record from the Person & Teacher database
var teacherList = (from p in DB.Persons
join t in DB.Teachers
on p.ID equals t.TID
select new
{
p.ID,
p.FName,
p.LName,
p.DOB,

p.Phone,
p.Add1,
p.Add2,
p.Suburb,
p.State,
p.Postcode,
t.RegNo
}
).ToList();
// Update the Student ID combo box data
{
cmbPersonIDU.DataSource = teacherList;
}
txtTeacherRegA.Clear(); // reset the teacher registration text field on the Add Tab
}
{
// Select the Administrator record from the Person & Administrator database
var adminList = (from p in DB.Persons
join a in DB.Administrations
on p.ID equals a.AID
select new
{
p.ID,
p.FName,
p.LName,
p.DOB,
p.Phone,
p.Add1,
p.Add2,
p.Suburb,
p.State,
p.Postcode,
a.Role
}
).ToList();
// Update the Student ID combo box data
{
cmbPersonIDU.DataSource = adminList;
}
txtAdminRoleA.Clear(); // reset the Administrator registration text field on the Add
Tab
}
else
{
}
// Reset all the Person Fields on the Add Tab
txtFirstNameA.Clear();
txtLastNameA.Clear();

dtpDateOfBirthA.Value = DateTime.Today; // Reset the birthday to todays date
txtPhoneA.Clear();
txtAddress1A.Clear();
txtAddress2A.Clear();
txtSuburbA.Clear();
txtPostcodeA.Clear();
}
// This method ensures that the correct data is displayed for the student, teacher
// and administrator when either the update screen is updated or the
// value in the student id combo box has changed.
// It is called by the cmbStudentIDU_SelectedIndexChanged
// and btnUpdateU_Click events
{
string selectedState; // store for the selected state branch statement
// Select the Student record from the Person & Student database
var person = (from p in DB.Persons
where p.ID == Convert.ToInt32(cmbPersonIDU.Text)
select p).First();
txtFirstNameU.Text = person.FName;
txtLastNameU.Text = person.LName;
dtpDateOfBirthU.Value = person.DOB;
txtPhoneU.Text = person.Phone;
txtAddress1U.Text = person.Add1;
txtAddress2U.Text = person.Add2;
txtSuburbU.Text = person.Suburb;
// Put the right State in the State Combo Box
selectedState = person.State;
switch (selectedState)
{
case "NSW":
cmbStateU.SelectedIndex = 0;
break;
case "VIC":
break;
case "QLD":
break;
case "SA":
break;
case "WA":
break;
case "ACT":
break;
case "NT":
break;
case "TAS":
break;
default:
}

txtPostcodeU.Text = person.Postcode;
{
// Select the required data
var student = (from s in DB.Students
where s.SID == Convert.ToInt32(cmbPersonIDU.Text)
select s).First();
dtpStartDateU.Value = student.Sdate;
var qualcodes = (from q in DB.Qualifications
cmbQualificationCodeU.DisplayMember = "QCode";
cmbQualificationCodeU.ValueMember = "QCode";
cmbQualificationCodeU.DataSource = qualcodes;
//Put the correct Qualification Code in the Combo Box
int codeCount = 0;
int theCode = 0;
foreach (string code in qualcodes)
{
if (code == student.QCode)
{
}
codeCount++;
}
cmbQualificationCodeU.SelectedIndex = theCode;
// Lookup the selected courses name and put it in the adjacent label
// on the form
var qualname = (from n in DB.Qualifications
where n.QCode == cmbQualificationCodeU.SelectedItem.ToString()
lblQNameU.Text = qualname;
}
{
var teacher = (from t in DB.Teachers
where t.TID == Convert.ToInt32(cmbPersonIDU.Text)
select t.RegNo).First();
txtTeacherRegU.Text = teacher;
}
{
var admin = (from a in DB.Administrations
where a.AID == Convert.ToInt32(cmbPersonIDU.Text)
select a.Role).First();
txtAdminRoleU.Text = admin;
}
else
{
}
}
// the criteria set by the Student ID Combo box selection. The script that

// performs this has been moved to the selectTheRecord method.
private void cmbStudentIDU_SelectedIndexChanged(object sender, EventArgs e)
{
selectTheRecord();
}
// This method tests the First Name to make sure that it is not blank
private bool ValidFirstName (string firstName, string tab)
{
if(firstName != "")
{
if (tab == "Add")
{
lblFirstNameMessageA.Text = "";
}
{
lblFirstNameMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblFirstNameMessageA.Text = "Please enter a first name";
}
else if(tab == "Update")
{
lblFirstNameMessageU.Text = "Please enter a first name";
}
return false;
}
}
// This method tests the Last Name to make sure that it is not blank
private bool ValidLastName(string lastName, string tab)
{
if (lastName != "")
{
if (tab == "Add")
{
lblLastNameMessageA.Text = "";
}
{
lblLastNameMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblLastNameMessageA.Text = "Please enter a last name";
}
{

lblLastNameMessageU.Text = "Please enter a last name";
}
return false;
}
}
// This method tests the birth date to make sure it is not the current
// date - ie, it hasn't been overlooked
private bool BirthNotToday(DateTime dob, string tab)
{
if (dob != DateTime.Today)
{
if (tab == "Add")
{
lblDOBMessageA.Text = "";
}
{
lblDOBMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblDOBMessageA.Text = "Please enter the correct birth date";
}
{
lblDOBMessageU.Text = "Please enter the correct birth date";
}
return false;
}
}
// This method tests the Phone to make sure that it is not blank
private bool ValidPhone(string phone, string tab)
{
if (phone != "")
{
if (tab == "Add")
{
lblPhoneMessageA.Text = "";
}
{
lblPhoneMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblPhoneMessageA.Text = "Please enter a phone number";
}
{
lblPhoneMessageU.Text = "Please enter a phone number";
}
return false;
}
}

// This method tests the phone number to make sure that it is a numeric
private bool ValidPhoneNumber(string phoneNumber, string tab)
{
if (tab == "Add")
{
int n1;
bool isNumber = int.TryParse(txtPhoneA.Text, out n1);
if (isNumber == true)
{
return true;
}
else
{
lblPhoneMessageA.Text = "Please enter just numbers for phone number";
return false;
}
}
else //if (tab == "Update")
{
int n1;
bool isNumber = int.TryParse(txtPhoneU.Text, out n1);
{
return true;
}
else
{
lblPhoneMessageU.Text = "Please enter just numbers for phone number";
return false;
}
}
}
// This method tests the phone number entry to check that it is only 10 characters long
private bool ValidPhoneNumberLength(string phone, string tab)
{
if (phone.Length == 10)
{
if (tab == "Add")
{
}
{
}
return true;
}
else
{
if (tab == "Add")
{
lblPhoneMessageA.Text = "Please enter just 10 digits for phone number";
}
{

lblPhoneMessageU.Text = "Please enter just 10 digits phone number";
}
return false;
}
}
// Check that the right telephone area code is selected for the right state.
private bool ValidPhoneForState(string state, string phone, string tab)
{
if ((state == "NSW" | state == "ACT") & int.Parse(phone.Substring(0, 2)) == 02)
{
if (tab == "Add")
{
}
{
}
return true;
}
else if (state == "VIC" & int.Parse(phone.Substring(0, 2)) == 03)
{
if (tab == "Add")
{
}
{
}
return true;
}
else if (state == "QLD" & int.Parse(phone.Substring(0, 2)) == 07)
{
if (tab == "Add")
{
}
{
}
return true;
}
else if (state == "SA" & int.Parse(phone.Substring(0, 2)) == 08)
{
if (tab == "Add")
{
}
{
}
return true;
}
else if (state == "WA" & int.Parse(phone.Substring(0, 2)) == 08)
{
if (tab == "Add")
{
}

{
}
return true;
}
else if (state == "NT" & int.Parse(phone.Substring(0, 2)) == 08)
{
if (tab == "Add")
{
}
{
}
return true;
}
else if (int.Parse(phone.Substring(0, 2)) == 04) // Mobile Phone
{
if (tab == "Add")
{
}
{
}
return true;
}
else
{
switch (state)
{
case "NSW":
case "ACT":
if (tab == "Add")
{
lblPhoneMessageA.Text = "Please change the Area Code to 02";
}
{
lblPhoneMessageU.Text = "Please change the Area Code to 02";
}
break;
case "VIC":
case "TAS":
if (tab == "Add")
{
}
{
};
break;
case "QLD":
if (tab == "Add")
{
}
{

}
break;
case "NT":
case "SA":
case "WA":
if (tab == "Add")
{
}
{
};
break;
case "":
if (tab == "Add")
{
lblPhoneMessageA.Text = "Please select a State to verify the area code";
}
{
lblPhoneMessageU.Text = "Please select a State to verify the area code";
}
break;
default:
}
return false;
}
}
// This method tests the address1 to make sure that it is not blank
private bool ValidAddress1(string address1, string tab)
{
if (address1 != "")
{
if (tab == "Add")
{
lblAddress1MessageA.Text = "";
}
{
lblAddress1MessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblAddress1MessageA.Text = "Please enter an address";
}
{
lblAddress1MessageU.Text = "Please enter an address";
}
return false;
}
}
// This method tests the suburb to make sure that it is not blank
private bool ValidSuburb(string suburb, string tab)
{

if (suburb != "")
{
if (tab == "Add")
{
lblSuburbMessageA.Text = "";
}
{
lblSuburbMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblSuburbMessageA.Text = "Please enter an suburb";
}
{
lblSuburbMessageU.Text = "Please enter an suburb";
}
return false;
}
}
// This method tests the state to make sure that it is not blank
private bool ValidState(string state, string tab)
{
if (state != "")
{
if (tab == "Add")
{
lblStateMessageA.Text = "";
}
{
lblStateMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblStateMessageA.Text = "Please select a state";
}
{
lblStateMessageU.Text = "Please select a state";
}
return false;
}
}
// This method tests the postcode to make sure that it is not blank
private bool ValidPostcode(string postcode, string tab)
{
if (postcode != "")
{
if (tab == "Add")
{
lblPostcodeMessageA.Text = "";
}

{
lblPostcodeMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblPostcodeMessageA.Text = "Please enter a postcode";
}
{
lblPostcodeMessageU.Text = "Please enter a postcode";
}
return false;
}
}
// This method tests the postcode to make sure that it is a numeric
private bool ValidPostcodeNumber(string postcode, string tab)
{
if (tab == "Add")
{
int n1;
bool isNumber = int.TryParse(txtPostcodeA.Text, out n1);
{
return true;
}
else
{
lblPostcodeMessageA.Text = "Please enter a numeric value for postcode";
return false;
}
}
else // tab = Update
{
int n1;
bool isNumber = int.TryParse(txtPostcodeU.Text, out n1);
{
return true;
}
else
{
lblPostcodeMessageU.Text = "Please enter a numeric value for postcode";
return false;
}
}
}
// Check that the right postcode is selected for the right state.
private bool ValidPostcodeForState(string state, string postcode, string tab)
{
if (state == "NT" & int.Parse(postcode) >= 800 & int.Parse(postcode) <= 899)
{
if (tab == "Add")

{
}
{
}
return true;
}
else if ((state == "NSW" | state == "ACT") & int.Parse(postcode) >= 2000 &
int.Parse(postcode) <= 2999)
{
if (tab == "Add")
{
}
{
}
return true;
}
else if (state == "VIC" & int.Parse(postcode) >= 3000 & int.Parse(postcode) <= 3999)
{
if (tab == "Add")
{
}
{
}
return true;
}
else if (state == "QLD" & int.Parse(postcode) >= 4000 & int.Parse(postcode) <= 4999)
{
if (tab == "Add")
{
}
{
}
return true;
}
else if (state == "SA" & int.Parse(postcode) >= 5000 & int.Parse(postcode) <= 5999)
{
if (tab == "Add")
{
}
{
}
return true;
}
else if (state == "WA" & int.Parse(postcode) >= 6000 & int.Parse(postcode) <= 6999)
{
if (tab == "Add")
{
}

{
}
return true;
}
else
{
switch (state)
{
case "NT":
if (tab == "Add")
{
lblPostcodeMessageA.Text = "Postcode must be between 0800 and 0899";
}
{
lblPostcodeMessageU.Text = "Postcode must be between 0800 and 0899";
}
break;
case "NSW":
case "ACT":
if (tab == "Add")
{
}
{
}
break;
case "VIC":
if (tab == "Add")
{
}
{
}
break;
case "QLD":
if (tab == "Add")
{
}
{
}
break;
case "SA":
if (tab == "Add")
{
}
{
}
break;
case "WA":
if (tab == "Add")

{
}
{
}
break;
case "TAS":
if (tab == "Add")
{
}
{
}
break;
case "": // make sure that there is something entered for state
if (tab == "Add")
{
lblPostcodeMessageA.Text = "Please select a State to verify the postcode";
}
{
lblPostcodeMessageU.Text = "Please select a State to verify the postcode";
}
break;
default:
}
return false;
}
}
// Check that data has been entered for the teachers registration
private bool validateRegistration(string registrationNo, string tab)
{
if (registrationNo != "")
{
if (tab == "Add")
{
lblTeacherRegMessageA.Text = "";
}
{
lblTeacherRegMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblTeacherRegMessageA.Text = "Please enter a registration number";
}
{
lblTeacherRegMessageU.Text = "Please enter a registration number";
}
return false;
}
}
// Check that data has been entered for the administrator role

private bool validateRole(string roleName, string tab)
{
if (roleName != "")
{
if (tab == "Add")
{
lblAdminRoleMessageA .Text = "";
}
{
lblAdminRoleMessageU.Text = "";
}
return true;
}
else
{
if (tab == "Add")
{
lblAdminRoleMessageA.Text = "Please enter an admin role";
}
{
lblAdminRoleMessageU.Text = "Please enter an admin role";
}
return false;
}
}
// This method adds a Person to the Person and
// Student/Teacher/Administrator tables
// once the data on the form has been validated.
{
try
{
// This section of code applies to the data entry fields
// for the Person table
// Test that a first name has been entered
if(!ValidFirstName(txtFirstNameA.Text, theTab))
{
return;
}
// Test that a last name has been entered
if (!ValidLastName(txtLastNameA.Text, theTab))
{
return;
}
// Test that a proper birth date has been entered
if (!BirthNotToday(dtpDateOfBirthA.Value, theTab))
{
return;
}
// Test that a phone number has been entered
if (!ValidPhone(txtPhoneA.Text, theTab))
{
return;
}

// Test that the phone number is numeric
if (!ValidPhoneNumber(txtPhoneA.Text, theTab))
{
return;
}
// Test that the phone number has only 10 digits
if (!ValidPhoneNumberLength(txtPhoneA.Text, theTab))
{
return;
}
// Test that the correct area code for phone number has been entered
if (!ValidPhoneForState(cmbStateA.Text, txtPhoneA.Text, theTab))
{
return;
}
// Test that address1 has been entered
if (!ValidAddress1(txtAddress1A.Text, theTab))
{
return;
}
// Test that a suburb has been entered
if (!ValidSuburb(txtSuburbA.Text, theTab))
{
return;
}
// Test that a state has been entered
if (!ValidState(cmbStateA.Text, theTab))
{
return;
}
// Test that a postcode has been entered
if (!ValidPostcode(txtPostcodeA.Text, theTab))
{
return;
}
// Test that the postcode is a numeric
if (!ValidPostcodeNumber(txtPostcodeA.Text, theTab))
{
return;
}
// Test that a correct postcode has been entered
if (!ValidPostcodeForState(cmbStateA.Text, txtPostcodeA.Text, theTab))
{
return;
}
// Test that a Teacher Registration has been entered
if (MainMenuForm.MenuChoice == "Teacher")
{
if (!validateRegistration(txtTeacherRegA.Text, theTab))
{
return;
}
}

// Test that an admin role has been entered
if (MainMenuForm.MenuChoice == "Administrator")
{
if (!validateRole(txtAdminRoleA.Text, theTab))
{
return;
}
}
// Create a new person object for the student and add its properties
var newPerson = new Person();
newPerson.FName = txtFirstNameA.Text.Trim();
newPerson.LName = txtLastNameA.Text.Trim();
newPerson.DOB = dtpDateOfBirthA.Value;
newPerson.Phone = txtPhoneA.Text;
newPerson.Add1 = txtAddress1A.Text.Trim();
newPerson.Add2 = txtAddress2A.Text.Trim();
newPerson.Suburb = txtSuburbA.Text.Trim();
newPerson.State = cmbStateA.SelectedItem.ToString();
newPerson.Postcode = txtPostcodeA.Text.Trim();
newPerson.Type = MainMenuForm.MenuChoice; // either Student, Teacher or Administrator
// Add the new person to the database
DB.Persons.InsertOnSubmit(newPerson);
DB.SubmitChanges();
// Get the newly created person ID number
var newPersonID = newPerson.ID;
{
// Create new student object and add its properties
var newStudent = new Student();
newStudent.SID = newPersonID;
newStudent.Sdate = dtpStartDateA.Value;
newStudent.QCode = cmbQualificationCodeA.SelectedItem.ToString();
// Add the new student specific data to the database
DB.Students.InsertOnSubmit(newStudent);
DB.SubmitChanges();
// Setup the required courses for the Student_Course Table
try
{
var courseNumbers = (from c in DB.Qualification_Courses
where c.QCode ==
cmbQualificationCodeA.SelectedItem.ToString()
int index = 0;
foreach (int c in courseNumbers)
{
var newStudentCourse = new Student_Course();
newStudentCourse.CID = courseNumbers[index];
newStudentCourse.SID = newPersonID;
newStudentCourse.Mark = 0;
DB.Student_Courses.InsertOnSubmit(newStudentCourse);
DB.SubmitChanges();
index++;
}
}

{
}
}
{
// Create new teacher object and add its properties
var newTeacher = new Teacher();
newTeacher.TID = newPersonID;
newTeacher.RegNo = txtTeacherRegA.Text.Trim();
newTeacher.Password = "teacher"; // A new Default password
// Add the new teacher specific data to the database
DB.Teachers.InsertOnSubmit(newTeacher);
DB.SubmitChanges();
lblAddMessage.Text = "Teacher ID " + newPersonID + " was added with a temporary
password 'teacher'. rnPlease get " + txtFirstNameA.Text + " to change this password as soon as
possible";
}
{
// Create new administrator object and add its properties
var newAdministration = new Administration();
newAdministration.AID = newPersonID;
newAdministration.Role = txtAdminRoleA.Text.Trim();
newAdministration.Password = "adminis"; // A new default password
// Add the new student specific data to the database
DB.Administrations.InsertOnSubmit(newAdministration);
DB.SubmitChanges();
lblUpdateMessage.Text = "Administrator ID " + newPersonID + " was added with a
temporary password 'adminis'. rnPlease get " + txtFirstNameA.Text + " to change this password as soon
as possible";
}
else
{
}
lblUpdateMessage.Text = "ID " + newPersonID + " was added";
UpdateData(updated);
}
{
}
}
// This method updates the Person and Student/Teacher/Administration
// table once the data has been validated.
{
try
{
// Test that a first name has been entered
if (!ValidFirstName(txtFirstNameU.Text, theTab))
{
return;

}
// Test that a last name has been entered
if (!ValidLastName(txtLastNameU.Text, theTab))
{
return;
}
// Test that a proper birth date has been entered
if (!BirthNotToday(dtpDateOfBirthU.Value, theTab))
{
return;
}
// Test that a phone number has been entered
if (!ValidPhone(txtPhoneU.Text, theTab))
{
return;
}
// Test that the phone number is numeric
if (!ValidPhoneNumber(txtPhoneU.Text, theTab))
{
return;
}
// Test that the phone number has only 10 digits
if (!ValidPhoneNumberLength(txtPhoneU.Text, theTab))
{
return;
}
// Test that the correct area code for phone number has been entered
if (!ValidPhoneForState(cmbStateU.Text, txtPhoneU.Text, theTab))
{
return;
}
// Test that address1 has been entered
if (!ValidAddress1(txtAddress1U.Text, theTab))
{
return;
}
// Test that a suburb has been entered
if (!ValidSuburb(txtSuburbU.Text, theTab))
{
return;
}
// Test that a state has been entered
if (!ValidState(cmbStateU.Text, theTab))
{
return;
}
// Test that a postcode has been entered
if (!ValidPostcode(txtPostcodeU.Text, theTab))
{
return;
}
// Test that the postcode is a numeric
if (!ValidPostcodeNumber(txtPostcodeU.Text, theTab))

{
return;
}
// Test that a correct postcode has been entered
if (!ValidPostcodeForState(cmbStateU.Text, txtPostcodeU.Text, theTab))
{
return;
}
// Test that a Teacher Registration has been entered
if (MainMenuForm.MenuChoice == "Teacher")
{
if (!validateRegistration(txtTeacherRegU.Text, theTab))
{
return;
}
}
// Test that an admin role has been entered
if (MainMenuForm.MenuChoice == "Administrator")
{
if (!validateRole(txtAdminRoleU.Text, theTab))
{
return;
}
}
// Update the student record in the person database
var personList = (from p in DB.Persons
where p.ID == Convert.ToInt32(cmbPersonIDU.Text)
select p).First();
personList.FName = txtFirstNameU.Text.Trim();
personList.LName = txtLastNameU.Text.Trim();
personList.DOB = dtpDateOfBirthU.Value;
personList.Phone = txtPhoneU.Text.Trim();
personList.Add1 = txtAddress1U.Text.Trim();
personList.Add2 = txtAddress2U.Text.Trim();
personList.Suburb = txtSuburbU.Text.Trim();
personList.State = cmbStateU.SelectedItem.ToString();
personList.Postcode = txtPostcodeU.Text.Trim();
DB.SubmitChanges();
DB.Refresh(RefreshMode.OverwriteCurrentValues, DB.Persons);
{
// Update the student record in the Student database
var studentList = (from s in DB.Students
where s.SID == Convert.ToInt32(cmbPersonIDU.Text)
select s).First();
studentList.Sdate = dtpStartDateU.Value;
studentList.QCode = cmbQualificationCodeU.SelectedItem.ToString();
DB.SubmitChanges();
DB.Refresh(RefreshMode.OverwriteCurrentValues, DB.Students);

}
{
// Update the teacher object and add its properties
var teacherList = (from t in DB.Teachers
where t.TID == Convert.ToInt32(cmbPersonIDU.Text)
select t).First();
teacherList.RegNo = txtTeacherRegU.Text.Trim();
DB.SubmitChanges();
DB.Refresh(RefreshMode.OverwriteCurrentValues, DB.Teachers);
}
{
// Update the administrator object and add its properties
var adminList = (from a in DB.Administrations
where a.AID == Convert.ToInt32(cmbPersonIDU.Text)
select a).First();
adminList.Role = txtAdminRoleU.Text.Trim();
DB.SubmitChanges();
DB.Refresh(RefreshMode.OverwriteCurrentValues, DB.Administrations);
}
else
{
}
lblUpdateMessage.Text = "ID " + cmbPersonIDU.Text + " was updated";
updated = true; // Do not reset the Person ID combo box
selectTheRecord();
updated = false;
}
{
}
}
// This method deletes the selected Person id in the update table's
// id combo box.
{
try
{
DialogResult d = MessageBox.Show("Are you sure you want to delete this record?",
{
int idToDelete = (int)cmbPersonIDU.SelectedValue;

// Get the record that matches the criteria in the ID
// combo box
var deletedPerson = (from p in DB.Persons
where p.ID == idToDelete
select p).First();
DB.Persons.DeleteOnSubmit(deletedPerson);
{
var deletedStudent = (from s in DB.Students
where s.SID == idToDelete
select s).First();
DB.Students.DeleteOnSubmit(deletedStudent);
MessageBox.Show("Student deleted");
}
{
var deletedTeacher = (from t in DB.Teachers
where t.TID == idToDelete
select t).First();
DB.Teachers.DeleteOnSubmit(deletedTeacher);
MessageBox.Show("Teacher deleted");
}
{
// Delete the administrator record
var deletedAdministration = (from t in DB.Administrations
where t.AID == idToDelete
select t).First();
DB.Administrations.DeleteOnSubmit(deletedAdministration);
}
else
{
}
DB.SubmitChanges();
}
{
}
}
{
}
}
// Update the Qualification Name label every time the Combo Box value changes
private void cmbQualificationCodeA_SelectedIndexChanged(object sender, EventArgs e)
{
// Lookup the selected Qualification name and put it in the adjacent label

// on the form
where n.QCode == cmbQualificationCodeA.SelectedItem.ToString()
lblQNameA.Text = qualname;
}
// Update the Qualification Name label every time the Combo Box value changes
private void cmbQualificationCodeU_SelectedIndexChanged(object sender, EventArgs e)
{
where n.QCode == cmbQualificationCodeU.SelectedItem.ToString()
lblQNameU.Text = qualname;
}
{
}
{
}
}
}

using System;
using System.Data;
using System.Linq;
using System.Text;
{
// Written by : Paul Smyth
// Date of last issue : 9/9/2015
//
// This form allows the user to update his/her password.
// It prompts the user to input a new password twice, the
// second time is to verify that the first password was typed as
// intended. Once the new password has been validated, the
// Teacher/Administration table is updated.
//
// It takes the static variable personID from the logonForm
// to indicate theID of the user that has logged on to the system.
// This information is used to select the correct record from
// the teacher / Administration table to receive the password
// update.
public partial class ChangePasswordForm : Form
{
public ChangePasswordForm()
{
}
private void ChangePasswordForm_Load(object sender, EventArgs e)
{
clearPasswords(); // clear the text fields
lblPasswordMessage.Text = "Enter a new 7 character password.rnThen re-enter it for
verification purposes";
//Set up ToolTips for the form
toolTip1.SetToolTip(txtPassword1, "Enter a new 7 character password");
toolTip1.SetToolTip(txtPassword2, "Re-enter the new password rnfor verification
purposes");
toolTip1.SetToolTip(btnExit, "Return to Main Menu");
toolTip1.SetToolTip(btnUpdate, "Update the changed password");
}
// This method tests that the entered password is 7 characters long
private bool validPasswordLength(string thePassword)
{
if (thePassword.Length != 7)
{
lblPasswordMessage.Text = "The password must be seven characters long. rnPlease try
again";
clearPasswords();
return false;
}
else
{

lblPasswordMessage.Text = "";
return true;
}
}
// This method compares the two entered passwords
private bool validComparePasswords(string password1, string password2)
{
if (txtPassword1.Text != txtPassword2.Text)
{
lblPasswordMessage.Text = "The re-entered pasword is not identical. rnPlease try
again";
clearPasswords();
return false;
}
else
{
lblPasswordMessage.Text = "";
return true;
}
}
// This method clears the password text fields
internal void clearPasswords()
{
txtPassword1.Clear();
txtPassword2.Clear();
}
private void btnExit_Click(object sender, EventArgs e)
{
}
// This method checks the data input and if it is ok,
// write it to the Persons table.
private void btnUpdate_Click(object sender, EventArgs e)
{
// Test to see that the first password entry is the required length
if (!validPasswordLength(txtPassword1.Text))
{
return;
}
// Test to see if the two password entries are identical
if (!validComparePasswords(txtPassword1.Text, txtPassword2.Text))
{
return;
}
// Update the password entry in the table
if (LogonForm.personType == "Administrator")
{
var newPassword = (from p in DB.Administrations
where p.AID == Convert.ToInt32(LogonForm.personID)
select p).First();
newPassword.Password = txtPassword1.Text;
DB.SubmitChanges();

}
else if (LogonForm.personType == "Teacher")
{
var newPassword = (from p in DB.Teachers
where p.TID == Convert.ToInt32(LogonForm.personID)
select p).First();
newPassword.Password = txtPassword1.Text;
DB.SubmitChanges();
}
lblPasswordMessage.Text = "Password has been successfully updated";
}
}
}

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