private void DisplayAllControl(Control control, int step)
{
foreach (Control ctl in control.Controls)
{
string s = new string('-', step * 4) + ctl.GetType().Name + "〈" + ctl.ID + "〉";
Response.Write(s + "<br/>");
if (ctl.HasControls())
DisplayAllControl(ctl, step + 1);
}
}