public JsonResult GetNotificationRequest()
        {
            var notificationRegisterTime = Session["LastUpdated"] != null?Convert.ToDateTime(Session["LastUpdated"]) : DateTime.Now;

            NotificationComponent NC = new NotificationComponent();
            var list = NC.GetRequests(notificationRegisterTime);

            //update session here for get only new  requestDateTime
            Session["LastUpdate"] = DateTime.Now;
            return(new JsonResult
            {
                Data = list,
                JsonRequestBehavior = JsonRequestBehavior.AllowGet
            });
        }