對ddl的改變自動觸發事件

 $(function () {
                $("#txtPageNum").change(function () {
                document.location.href = '/admin/order/handing?ish=' + $("#txtIsHanded").val() + '&pi=1&ps=' + $("#txtPageNum").val();

            });

接收事件

 public ActionResult Handing(int? pi, int? ps, int? ish)