FindControl<T>

public static T FindControl<T>( this Control startingControl, string id) where T : Control
{
 T foundControl = default(T);

 int controlCount = startingControl.Controls.Count;

 foreach (Control c in startingControl.Controls)
 {
 if (c is T && string.Equals(id, c.ID, 
 StringComparison.InvariantCultureIgnoreCase))
 {
 foundControl = c as T;
 break;
 }
 else
 {
 foundControl = FindControl<T>(c, id);
 if (foundControl != null)
 {
 break;
 }
 }
 }
 return foundControl;
}

Button UpdateButton = Page.FindControl<Button>("UpdateButton");