public ActionResult ViewCart() { ViewBag.BookTop = BookAction.AddSachTop5ToDb(); if (TempData["Alert"] != null) { ViewBag.Alert = TempData["Alert"].ToString(); } if (Session["UserName"] != null && (int)Session["Role"] == 2) { int AccountId = (int)Session["UserID"]; if (Session["UserID"] == null) { return(RedirectToAction("Login", "Account")); } var listCart = BillAction.ListCartDetail(AccountId); if (listCart != null) { ViewBag.ListCart = listCart; ViewBag.Detail = listCart.FirstOrDefault(); } return(View()); } return(RedirectToAction("Login", "Account")); }