نکته شماره 61 :

 

private void btncolor_Click(object sender, EventArgs e)
{
    Random random = new Random();
 
    int red = RandomClass.Next(0, 255);
    int green = RandomClass.Next(0, 255);
    int blue = RandomClass.Next(0, 255);
 
    this.BackColor = Color.FromArgb(red, green, blue);         
}