code for textbox that textbox only accept caharcters or letters, if any textbox is empty then textbox color becomes red. all information show in other text box.

1. ASSIGNMENT # 4
SUBMITTED TO:
SIR RAMEEZ IQBAL
SUBMITTED BY:
RABIA ZAFAR
17581556-045
SECTION ‘A’
VISUAL PROGRAMMING

2. 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 assignment
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button2_Click(object sender, EventArgs e)
{
this.Close();
}
private void textBox4_TextChanged(object sender, EventArgs e)
{
}
private void textBox4_KeyPress(object sender, KeyPressEventArgs e)
{
e.Handled = !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar);
}

3. private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox3.Text == "Programmer")
{
MessageBox.Show("allowed");
}
else
{
MessageBox.Show("Please Enter correct Occupation");
}
if (textBox1.Text == "")
{
textBox1.BackColor = Color.Red;
}
if (textBox2.Text == "")
{
textBox2.BackColor = Color.Red;
}
if (textBox3.Text == "")
{
textBox3.BackColor = Color.Red;
}
if (textBox4.Text == "")
{
textBox4.BackColor = Color.Red;
}
}
private void textBox3_TextChanged(object sender, EventArgs e)
{
}
private void button3_Click(object sender, EventArgs e)
{
string str = "Name =" + textBox1.Text + Environment.NewLine + "Address ="
+ textBox2.Text + Environment.NewLine + "Occupation = " + textBox3.Text +
Environment.NewLine + "Age = " + textBox4.Text;
textBox5.Text = str;
}
}
}