CodePaste.NET

public static Control FindControlUsingStack(Control root, string id)
{
   // Seed it.
   Stack<Control> stack = new Stack<Control>();
   stack.Push(root);
 
   while(stack.Count > 0)
   {
      Control current = stack.Pop();
      if (current.ID == id)
         return current;
 
      foreach (Control control in current.Controls)
      {
         stack.Push(control);
      }
   }
   return null;
}