How to use RadioButton Control

Drag and drop three RadioButton from the toolbox on the window Form.

Code:

Write code in CheckedChanged event of RadioButton.

Double click on CheckedChanged event.

private void radioButton1_CheckedChanged(object sender,  EventArgs e)
{
    //RadioButton1 value will show in Label1 if RadioButton1 is selected
   label1.Text ="Selcted Language is  "+ radioButton1.Text;
}
private void radioButton2_CheckedChanged(object sender,  EventArgs e)
{
    //RadioButton2 value will show in Label1 if RadioButton2 is selected
    label1.Text = "Selcted Language is  " + radioButton2.Text;
}
  
 private void radioButton3_CheckedChanged(object sender,  EventArgs e)
 {
     //RadioButton3 value will show in Label1 if RadioButton3 is selected
    label1.Text = "Selcted Language is  " + radioButton3.Text;
  }

 Run the project

When you select any given option then CheckedChanged event will fire and selected value will show in the Label.

RadioButton Properties:

Appearance: Default value is Normal. Set the value to Button if you want the RadioButton to be displayed as a Button.

Example:

//set checkbox appearance as button
private void frmRadioButton_Load(object sender,  EventArgs e)
{
       radioButton1.Appearance = Appearance.Button;
       radioButton2.Appearance = Appearance.Button;
       radioButton3.Appearance = Appearance.Button;
}

Now RadioButton appearance is as button.

CheckAlign: CheckAlign property is used to align the check mark in a RadioButton.

BackColor:  RadioButton BackColor can be changed through BackColor Properties of RadioButton.

Example:

//Change RadioButton BackColor
private void frmRadioButton_Load(object sender,  EventArgs e)
{   
       radioButton1.BackColor = Color.CadetBlue;
       radioButton2.BackColor = Color.CadetBlue;
       radioButton3.BackColor = Color.CadetBlue;
}