public ActionResult Index(ItemListModel model, string message= "")
 {
     ViewBag.ErrorMessage = message;
     SessionHelper.Item = null;
     model.SOBId = SessionHelper.SOBId;
     return View(model);
 }
 public ActionResult ItemPartial(ItemListModel model)
 {
     return PartialView("_List", ItemHelper.GetItems(SessionHelper.SOBId));
 }