// GET: CheckOut public ActionResult Index() { var userID = (int?)Session["userID"]; if (userID != null) { var model = _cus.GetCustomerUserByUserId(userID.Value); if (model.Result != null) { ViewBag.currentUser = (model.Result); } } var boxes = (List <OrderDetailDTO>)Session["cartDetails"]; var SubTotal = boxes.Sum(x => x.TotalAmount); ViewBag.SubTotal = SubTotal; return(View(boxes)); }