Example with RadioButton:-

Add a new Form i.e.,FormRadio to the Windows Application WABasics

Create one label,one textboxe and four RadioButtons & set the following properties to them

label1:      Text      :         Enter Any Data      Name     :         lblSample textBox1:      Name     :         lblSample

radioButton1:      Text      :         Red      Name     :         optRed radioButton2:      Text      :         Green      Name     :         optGreen radioButton3:      Text      :         Blue      Name     :         optBlue radioButton4:      Text      :         Yellow      Name     :         optYellow

Design :-

 Generate theEventHandler for optRed,optGreen,optBlue,optYellow checkedChanged Events

& write the following code in Source[FormRadio.cs] 

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WABasics {     public partial class FormRadio : Form     {         public FormRadio()         {             InitializeComponent();         }         private void optRed_CheckedChanged(object sender, EventArgs e)         {             txtSample.BackColor = Color.Red;         }         private void Green_CheckedChanged(object sender, EventArgs e)         {             txtSample.BackColor = Color.Green;         }         private void optBlue_CheckedChanged(object sender, EventArgs e)         {             txtSample.BackColor = Color.Blue;         }         private void optYellow_CheckedChanged(object sender, EventArgs e)         {             txtSample.BackColor = Color.Yellow;         }             } }

Result :-