change button color if it selected in C#

Hi Cha, 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 WindowsFormsApplication1 { public partial class Form2 : Form { public Form2() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { button1.BackColor=Color.Red; button2.BackColor = Control.DefaultBackColor; button3.BackColor = Control.DefaultBackColor; } private void button2_Click(object sender, EventArgs e) { button2.BackColor = Color.Red; button1.BackColor = Control.DefaultBackColor; button3.BackColor = Control.DefaultBackColor; } private void button3_Click(object sender, EventArgs e) { button3.BackColor = Color.Red; button2.BackColor = Control.DefaultBackColor; button1.BackColor = Control.DefaultBackColor; } } } Thanks If this post helps you mark it as answer