private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
if (radioButton1.Checked == true)
button1.BackColor = Color.Red;
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
if (radioButton2.Checked == true)
button1.BackColor = Color.Blue;
}
private void button1_Click(object sender, EventArgs e)
{
button1.BackColor = Color.White;
radioButton1.Checked = false;
radioButton2.Checked = false;
}