Hi, i've got a problem here. i can't figure out why my form background and also the button change its color when i call the function below. how can i ensure that only the background changes? besides that, in the form i also need to draw and show some circles. How to ensure that when the background color changes, it still there?

public void b1_click(object sender, EventArgs e)
{
clg.ShowDialog();
this.BackColor = clg.Color;


}