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C# RadioButton Control

A radio button or option button enables the user to select a single option from a group of choices when paired with other RadioButton controls. When a user clicks on a radio button, it becomes checked, and all other radio buttons with same group become unchecked

C# radiobutton

The RadioButton control can display text, an Image, or both. Use the Checked property to get or set the state of a RadioButton.

  radioButton1.Checked = true;

The radio button and the check box are used for different functions. Use a radio button when you want the user to choose only one option. When you want the user to choose all appropriate options, use a check box. Like check boxes, radio buttons support a Checked property that indicates whether the radio button is selected.




using System;
using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            radioButton1.Checked = true;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (radioButton1.Checked == true)
            {
                MessageBox.Show ("You are selected Red !! ");
                return;
            }
            else if (radioButton2.Checked == true)
            {
                MessageBox.Show("You are selected Blue !! ");
                return;
            }
            else
            {
                MessageBox.Show("You are selected Green !! ");
                return;
            }
        }
    }
}




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