public ActionResult Create(PromotionDetailViewModel ctkm)
        {
            if (ModelState.IsValid)
            {
                CHITIETKM chitietkm = new CHITIETKM();
                chitietkm.MAKM       = ctkm.MAKM;
                chitietkm.MASP       = ctkm.MASP;
                chitietkm.PHANTRAMKM = ctkm.PHANTRAMKM;

                if (promotionDetailService.addPromotionDetail(chitietkm))
                {
                    ViewBag.message = "Thêm mới chi tiết khuyến mãi thành công";
                }
            }
            ViewBag.KHUYENMAIx = promotionDetailService.getALLPromotion();
            ViewBag.SANPHAMx   = promotionDetailService.getAllProduct();
            return(View(ctkm));
        }
        public ActionResult Update(PromotionDetailViewModel ctkm)
        {
            if (ModelState.IsValid)
            {
                CHITIETKM chitietkm = new CHITIETKM();
                chitietkm.MAKM       = ctkm.MAKM;
                chitietkm.MASP       = ctkm.MASP;
                chitietkm.PHANTRAMKM = ctkm.PHANTRAMKM;

                if (promotionDetailService.updatePromotionDetail(chitietkm))
                {
                    return(RedirectToAction("Index", "PromotionDetail", promotionDetailService.getAllPromotionDetail()));
                }
            }
            CHITIETKM chitiet = promotionDetailService.getOnePromotionDetail(ctkm.MAKM, ctkm.MASP);

            ViewBag.KHUYENMAI = chitiet.KHUYENMAI.TENKM;
            ViewBag.SANPHAM   = chitiet.SANPHAM.TENSP;
            return(View(ctkm));
        }