string GetPostBackEventReference(Control control, string argument) { if (control == null) { throw new ArgumentNullException("control"); } page.RequiresPostBackScript(); if (page.IsMultiForm) { return(page.theForm + ".__doPostBack('" + control.UniqueID + "','" + argument + "')"); } else { return("__doPostBack('" + control.UniqueID + "','" + argument + "')"); } }