VB Dot net

.NET Technology
By
Akber Ahmed Khowaja

Today’s Discussion
 What We Expect From Language?
 What is new in .NET?
 Comparisons with Previous Technologies /
JAVA / VB-6 etc.
 First Look of VB .NET

What is in Language?
 Interaction With Other Language
 Platform Support
 Programming Technique (structured ? Procedural? OOP?)
 Databases Support
 Database Handling Technique
 Thread Model
 Component Designing?

 Network Support Programming? (Socket Programming)
 Internet Programming ?
 Future / Reliability?

What is new in .NET Technology
.NET Framework covers all the layers of software
development from the operating system up

.NET Framework
ASP.NET
Web Services Web Forms
ASP.NET Application Service
Windows Forms
Controls Drawing
Windows Application Service
.NET Framework Base Classes
ADO.NET XML Threading IO
Net Security Diagnoses Etc.
Common Language Runtime
Memory
Management
Common Type System
Lifecycle
Monitoring

Windows Forms (Winforms)
Windows Form are a new way to create Standard WIN32
Desktop Application based on the Windows Foundation
Classes(WFC)

Web Forms
Web Forms provide a powerful, form based user interface for
web, it also contains additional .net ASP controls which was
not present in previous versions, These controls provide
Sever based events facility so that our application can be
develop more easily and attractive.

Web Services
Provides a mechanism for programs to communicate over
the Internet using SOAP (Simple Object Access Protocol).
Web Services provide an analog of Com and DCOM for
object brokering and interfacing, but based on internet
technologies so that allowance is made for integration,
even with non Microsoft plateforms

CLR (Common Language Runtime)
Common Type System
Data Types / etc
Intermediate Language to
Native Code Compiler
Execution Support Security
Garbage Collection
Memory Management(Previous version it was done by OS)

Multiple Language Support
.Net Environment Provides Multiple language Integration
Support, se that we can use multiple Languages in single
program.
For Example we can C# function in ASP.NET as well as in
VB.NET
Cross language Inheritance is also Possible
So Mix Language development team can also participate to
develop program.
How IT is Possible ? Answer CLR

Common Type System
All Languages use same Data types, their Length, Size, Type
and specificaton will be same.
For example in Previous VB-6 use 16 bit Integer (2 bytes)
In Visual C integer was 4 Bytes.
Now For all .NET Support languages use int32 Integer for 4
Bytes.

Common Types
Boolean Sbyte (Signed Byte)
Byte Single
Char
Date/Time
Decimal
Double
Int16
Int32
Int46

Execution Support
JIT (Just in Time Compilation and Execution)
JIT Compiles with three methods:
1) Standard JIT: it Convert to exe code at the time of
execution
2) Pre JIT: it it convert to exe code at the time of
installation.
3) Econo JIT: it create low Optimization code, for low
memory resources

Programming Technique
OOP (Object Oriented Programming)
a) Encapsulation
b) Inheritance
c) Polymorphism

Form Level Inheritance
1 2
1 2
3 4
Form 1 Form2 inherited from
Form1

Database Handling
It use ADO+ or ADO.NET To handle different Databases
Disconnected Databases
SQL
OLEDB Drivers
(Will be discuss in Detail)

XML Support
 It Gives XML support to represent Fast Data

VB.NET Programming
By:
Akber Ahmed Khowaja

Today’s Discussion
 VS.NET (Visual Studio.net Environment)
 Working With WinForms & important
Properties
 Working With Events in .NET
 Data Base Creation with MS-SQL Server
 Database Handling with VS.NET

Database Handling With ADO.NET

 Import System.Data
 Import System.data.ADO
 Create and set SQLConnection
 Create and set SQL DataAdapter
 Create and set Dataset

Steps to Create & Set
SqlConnection
1. Place SqlConnection To Form (from Data
toolBox)
2. Set its name property to con1
3. Set its Connection Property using connection
Wizard

Steps to Create & Set DataAdapter
1. Put DataAdapter Control to form
2. Right click on That Control
3. Select Configure
4. Follow Steps to complete Process
5. Right Click on DataAdapter Control, and
select Create DATASET

Put Following Code on Form’s Load
Event
Private Sub Form1_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
da1.Fill(ds1, "ghufi")
End Sub

Private Sub cmdLast_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
Handles cmdLast.Click
cnt = Me.ds1.Tables("ghufi").Rows.Count
Me.BindingContext(ds1, "ghufi").Position = Me.BindingContext(ds1, "ghufi").Count - 1
MsgBox(cnt.ToString)
End Sub
Private Sub cmdNext_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles cmdNext.Click
Me.BindingContext(ds1, "ghufi").Position = Me.BindingContext(ds1, "ghufi").Position
+ 1
End Sub

Private Sub cmdPrev_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
Handles cmdPrev.Click
Me.BindingContext(ds1, "ghufi").Position = Me.BindingContext(ds1, "ghufi").Position -
1
End Sub
Private Sub cmdFirst_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles cmdFirst.Click
Me.BindingContext(ds1, "ghufi").Position = 0
End Sub

Todays Discussion
 Few Language Tips
 How To search
 Working wit DataGrid
 Add Records
 Save Records

Few Language Changes
 Data Types
 Declaration Methods
 Type Casting
 Option keyword
 Changes in Array

Data Types (Integers)
 Byte 8 Bits 0 to 255
 Short
 Integer
 Long

Floats
 Single
 Double
 Decimal 128 bits

Others
 Char
 String
 Varient  Object

Declaration of Variables
 Dim I , j , k as integer

Option
 Option Explicit On/Off
 Option Compare Binary/Text
 Option Strict On/Off (Data type conversion)

Find Records
On Load
txtfind.Text = ds1.ghufi.Columns.Count()
ComboBox1.Items.Add(ds1.ghufi.Columns(0).ColumnName)

Write Following Code under Find
Dim fldname As String
fldname = ComboBox1.SelectedItem()
ds1.Clear()
da1.SelectCommand.CommandText =
"select * from ghufi where " & fldname & "='" & txtfind.Text & "'“
If Me.BindingContext(ds1, "ghufi").Count <= 0 Then
MsgBox("Sorry No Record for your Search")
End If

Today’s Discussion (03/11/2002)
 New Control “Notify Icon”
 How to Navigate B/W Forms
 Inheritance in Forms
 How User Master Details
 Add / Save

NotifyIcon Control
Notify Icon is a new control which put a link on System
Tray, it automatically creates a new panel in system tray and
shows Icon.
It’s Click Event Fires when we double click on that Icon.
We may use it for new form load, or terminate Application.

Steps to use NotifyTray
 Drag and drop this control on Form
 Set it’s Icon Property with any suitable Icon
 Write “End” to its click event

Its coding is
Public Class Form4
Inherits System.Windows.Forms.Form
Private Sub Form4_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles
MyBase.Load
End Sub
End Class

Change this coding as
Public Class Form4
Inherits System.amin.form3
Private Sub Form4_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles
MyBase.Load
End Sub
End Class
Set form4 as Default For and Run Program

Come back to Database
Master Details Forms

ListBox Properties, Datagrid Prop.

Code on ListIndexChanged
ds2.Clear()
da2.SelectCommand.CommandText = "select * from ghufi_details
where id=" &
CInt(sender.Text)
da2.Fill(ds2, "ghufi_details")

VB.Net Programming
By
Akber Ahmed Khowaja

 FileDialogBox
 SaveDialogBox
 FontDialogBox
 ColorDialogBox
 PrintDialogBox

Screen For Dialog Boxes
Open
Save
Font
Color
Print

Today’s Discussion (18/11/2002)
 Add New Record with Programming
 Edit Record
 Delete Record

OpenFileDialogBox
Imports System.IO
openDialog.Filter = "Text Files (*.txt)|*.txt|All Files|*.*“
openDialog.FilterIndex = 1
openDialog.InitialDirectory = "c:“
openDialog.Title = "Demo Open Dialog“
openDialog.ShowDialog()
strfilename = openDialog.FileName
Dim objreader As StreamReader = New StreamReader(strfilename)
TextBox1.Text = objreader.ReadToEnd

objreader.Close()
objreader = Nothing
Do Until objreader.Read = -1
TextBox1.Text = TextBox1.Text &
objreader.ReadLine & vbCrLf
Loop

SaveDialog & FileStreamWriter
With saveDialog
.DefaultExt = "txt“
.FileName = strfilename
.Filter = "Text Files(*.txt)|*.txt|All Files|*.*“
.FilterIndex = 1
.InitialDirectory = "c:“
.OverwritePrompt = True
.Title = "File Save Demo“
End With
saveDialog.ShowDialog()
strfilename = saveDialog.FileName

Dim objwriter As StreamWriter = New
StreamWriter(strfilename, False)
objwriter.Write(TextBox1.Text)
objwriter.Close()
objwriter = Nothing

FontDialogBox
FontDialog.ShowColor = True
FontDialog.ShowDialog()
TextBox1.Font = FontDialog.Font

Color Dialog
colorDialog.ShowDialog()
TextBox1.ForeColor = FontDialog.Color

Print Dialog
PrintDialog.AllowPrintToFile = False
PrintDialog.AllowSelection = False
PrintDialog.AllowSomePages = False
PrintDialog.ShowDialog()

Steps To Design Menu
 There are two Types of Menues
– Main Menu
– Context Menu

Main Menu
This Menu Appear Normally on the Top of the form, this is very
common menu for windows base applications.
ie. File, Edit, View etc
Context Menu
This menu is Small Menu Which appears when user right click
on Any Form Item

Steps To Design Main Menu
 Drag and drop main menu from Toolbox
 Write Menu Name
 Use & for Access Keys
 Set Properties of every menu
– Name
– Shortcut

Steps Context Menu
 Drag and drop Context menu from ToolBox
 Design some menu items
Every Control has Context menu property, we
bind context menu property to context menu,
so that menu will appear when user right click
on that menu

Import
Imports System.Data
Imports System.Data.OleDb
Imports System.DBNull

Declarations
Public Class Form2
Inherits System.Windows.Forms.Form
Public con As OleDbConnection = New
OleDbConnection("Provider=Microsoft.jet.
oledb.4.0; data
source=d:LibrarySystemlibrary.mdb")
Public da As OleDbDataAdapter
Public ds As DataSet
Public dw As DataView
Public cm As CurrencyManager

Initializations (call two functions)
'Add any initialization after the
InitializeComponent() call
FillData()
bindFields()

FillData Function
Private Sub FillData()
dw = Nothing
ds = New DataSet()
con.Open()
da = New OleDbDataAdapter("select *
from books", con)
da.Fill(ds, "books")
dw = New DataView(ds.Tables("books"))
cm = CType(Me.BindingContext(dw),
CurrencyManager)
con.Close()
End Sub

DataBinding Function
Private Sub bindFields()
TextBox1.DataBindings.Clear()
TextBox2.DataBindings.Clear()
TextBox1.DataBindings.Add("text", dw, "code")
TextBox2.DataBindings.Add("text", dw, "Name")
End Sub

Add Button Code
TextBox1.Text = ""
TextBox2.Text = ""
TextBox3.Text = ""
TextBox4.Text = ""

Save Button
Dim pos As Integer
pos = cm.Position
Dim cmd As New OleDbCommand()
cmd.Connection = con
cmd.CommandText = "Insert into books (code,
name, author) values(?,?,?)“
cmd.CommandType = CommandType.Text
con.Open()

cmd.Parameters.Add(New OleDbParameter())
cmd.Parameters.Item(0).Direction = ParameterDirection.Input
cmd.Parameters.Item(0).DbType = DbType.String
cmd.Parameters.Item(0).Size = 10
cmd.Parameters.Item(0).Value = TextBox1.Text

Try
cmd.ExecuteNonQuery()
Catch ex As Exception
MsgBox("Error:=" & ex.Message)
End Try
con.Close()
FillData()
bindFields()
MsgBox("Record Added")
ds = Nothing
da = Nothing
cmd = Nothing

Edit
cmd.CommandText = "update books set
name=?,author=? where code=?"

Delete
cmd.CommandText = “delete from books where code=?"
Pos=1

Me.BindingContext(ds1, "ghufi").AddNew()
da1.Update(ds1, "ghufi")

Handling ADO With Coding
By
Akber Ahmed Khowaja

Code for Import Files
Imports System.Data
Imports System.Data.OleDb
Imports System.DBNull
Public Class Form2
. . . . .
. . . . .

Variable Declaration
• For Connection
• For Data Adapter
• For Dataset

Today’s Discussion (Dec 02, 2002)
 Concept Of OOP
 What is Class
 Simple Class
 Methods
 Constructors
 Properties
 Data Base Handling With Class

What is OOP
OOP is Programming technique in which we make programs
Flexible and Reusable.
Basic Concept of OOP is Designing Classes in Program.

What is Class
Class is Collection of Data / Properties and
Methods/Functions which operate on that data.
Methods and Data are Encapsulated in Class, is
called Encapsulation
We may Inherit functionality of one class to other class is
called Inheritance.
With class one object may work with different ways is
called Polymorphism

A Simple Class
Write Click On Project add Class to your project
Public Class Person
Public FName As String
Public LName As String
Public Age As Integer
End Class

Form for Usage of “Person” class

Create Object for “Person” Class
Dim p1 As New Person()

Code for Insert Data / Show Data
Buttons
p1.FName = TextBox1.Text
p1.LName = TextBox2.Text
p1.Age = CInt(TextBox3.Text)
TextBox1.Text = p1.FName
TextBox2.Text = p1.LName
TextBox3.Text = p1.Age

Encapsulation (Private Data and
Access public Methods)
Public Class Person
Private FName As String
Private LName As String
Private Age As Integer
'setdata Method
Public Sub setData(ByVal Fnm As String, ByVal LNm As
String, ByVal ag As Integer)
FName = Fnm
LName = LNm
Age = ag
End Sub

Public Function getFName() As String
Return (FName)
End Function
Public Function getLName() As String
Return (LName)
End Function
Public Function getAge() As Integer
Return (Age)
End Function
End Class

Constructor
Constructor is Special Type of method which call
automatically when object creates, we may use constructor
for data initialization.
Public Sub New()
FName = "FName Not Set"
LName = "LName Not Set"
Age = 0
End Sub

Array Of Objects
Dim p(10) As Person
Dim cntr As Integer

Screen For Use Array of Objects

Code for Set Data Button
p(cntr) = New Person()
p(cntr).setData(TextBox1.Text,
TextBox2.Text, CInt(TextBox3.Text))
MsgBox("Data Stored as index number : " & CStr(cntr))
cntr += 1

Code for Show Data Button
Dim xx As Integer
xx = txtIndex.text
TextBox1.Text = p(xx).getFName()
TextBox2.Text = p(xx).getLName()
TextBox3.Text = p(xx).getAge()

Properties For Class
Property FName() As String
Get
Return (XFName)
End Get
Set(ByVal Value As String)
XFName = Value
End Set
End Property

Use Properties
dim t1 as new Teacher() ‘ teacher is class
t1.FName = TextBox1.Text
t1.LName = TextBox2.Text
t1.Age = TextBox3.Text

Data base Handling with class
Public Class DataClass
Public con As OleDbConnection
Public da As OleDbDataAdapter
Public ds As DataSet
Public dw As DataView
Public cm As CurrencyManager

Method Open Connection
Public Sub openConnection(ByVal constr As String)
con = New OleDbConnection(constr)
con.Open()
End Sub
‘’’’’’’’’’’’’’’’’’’’’’’’’’’’
Private Sub setDa(ByVal sqlstr As String, ByVal cn As
OleDbConnection)
da = New OleDbDataAdapter(sqlstr, cn)
End Sub

Public Sub FillData(ByVal sqlstr As String, ByVal dbnm As
String, ByVal tblnm As String)
dw = Nothing
ds = New DataSet()
OpenConnection("Provider=Microsoft.jet.oledb.4.0; data
source=f:Inventory_VBNETInventorySystem" & dbnm)
setDa(sqlstr, con)
da.Fill(ds, tblnm)
dw = New DataView(ds.Tables(tblnm))
con.Close()
End Sub

Move Records
Public Sub MoveRecord(ByVal bc As
BindingContext, ByVal tblnm As String,
ByVal symbol As String)
If symbol = ">" Then
bc(ds, tblnm).Position += 1
ElseIf symbol = "<" Then
bc(ds, tblnm).Position -= 1
ElseIf symbol = "<<" Then
bc(ds, tblnm).Position = 0
ElseIf symbol = ">>" Then
bc(ds, tblnm).Position = bc(ds, tblnm).Count – 1
End If

Usage
‘Create Object
Dim obj As New DataClass()
'Add any initialization after the
InitializeComponent() call
obj.FillData("select * from items", "Inventory.mdb",
"Items")
showData()

Private Sub showData()
Dim pos As Integer
pos = Me.BindingContext(obj.ds,
"items").Position
TextBox1.Text =
obj.ds.Tables("items").Rows(pos).Item("itemName")
End Sub
Show Data Method

Code For Next Button_Click
obj.MoveRecord(Me.BindingContext, "Items", ">")
showData()

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