public ActionResult CapNhatClient_GioHang(int csanphamid, FormCollection f)
        {
            List <Client_GioHang> listClient_GioHang = LayClient_GioHang();
            Client_GioHang        sanpham            = listClient_GioHang.SingleOrDefault(n => n.cSanPhamId == csanphamid);

            if (sanpham != null)
            {
                sanpham.cSoLuong = int.Parse(f["txtSoLuong"].ToString());
            }
            return(RedirectToAction("Client_GioHang"));
        }
        public ActionResult XoaClient_GioHang(int csanphamid)
        {
            //Lấy giỏ hànng từ session
            List <Client_GioHang> listGioHang = LayClient_GioHang();
            Client_GioHang        sanpham     = listGioHang.SingleOrDefault(n => n.cSanPhamId == csanphamid);

            if (sanpham != null)
            {
                listGioHang.RemoveAll(n => n.cSanPhamId == csanphamid);
                return(RedirectToAction("Client_GioHang"));
            }
            if (listGioHang.Count == 0)
            {
                return(RedirectToAction("Index", "Client_TrangChu"));
            }
            return(RedirectToAction("Client_GioHang"));
        }
        public ActionResult ThemClient_GioHang(int cSanPhamId, string strURL)
        {
            List <Client_GioHang> listClient_GioHang = LayClient_GioHang();
            Client_GioHang        sanpham            = listClient_GioHang.Find(n => n.cSanPhamId == cSanPhamId);

            if (sanpham == null)
            {
                sanpham = new Client_GioHang(cSanPhamId);
                listClient_GioHang.Add(sanpham);
                ViewBag.message = "Them Thanh Cong";
                return(Redirect(strURL));
            }
            else
            {
                sanpham.cSoLuong++;
                return(Redirect(strURL));
            }
        }