public async Task <ActionResult> Order()
        {
            var account       = (Account)Session[Constant.UserCustomerSession];
            var productOrders = await cardDAO.GetAllProductOrder(account.Id);

            if (productOrders == null)
            {
                return(Json(0));
            }
            long totalPrice = productOrders.Sum(x => x.Price * x.QuantityPurchased);
            var  bill       = new Bill
            {
                Address      = account.User.Address,
                CreationTime = DateTime.Now,
                BillStatus   = BillStatus.AwaitingApproval,
                TotalPrice   = totalPrice,
                VAT          = (long)(totalPrice * 0.1),
                AccountId    = account.Id
            };

            bill.Id = await billDAO.CreateBill(bill);

            var billInfos = productOrders.Select(x => new BillInfo
            {
                BillId            = bill.Id,
                Price             = x.Price,
                ProductId         = x.ProductId,
                QuantityPurchased = x.QuantityPurchased
            }).ToList();
            int res = await billDAO.CreateBillInfo(billInfos);

            if (res > 0)
            {
                TempData["Order"] = "Đơn hàng đã được thành công!";
            }
            return(Json(res));
        }