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

            NotificationComponent nc = new NotificationComponent();
            var list = nc.GetItems(notificationRegisterTime);

            Session["LastUpdate"] = DateTime.Now;
            return(new JsonResult {
                Data = list, JsonRequestBehavior = JsonRequestBehavior.AllowGet
            });
        }