public ActionResult Checkout(int[] quanti, double totalCheckout)
        {
            List <ProductForCart> cartItem = (List <ProductForCart>)Session["cart"];

            try
            {
                var idUser = Session["idUser"];
                //Lấy lại dữ liệu trong
                for (int i = 0; i < quanti.Length; i++)
                {
                    cartItem[i].quantity = quanti[i];
                }

                foreach (var item in cartItem)
                {
                    Cart c = new Cart
                    {
                        price      = item.price,
                        quantity   = item.quantity,
                        id_product = item.Id,
                        user_id    = Convert.ToInt32(idUser),
                        created_at = DateTime.Now,
                    };
                    carts.Insert_Cart(c);
                }

                #region Checkout
                Checkout itemCheckout = new Checkout
                {
                    id_user        = Convert.ToInt32(idUser.ToString()),
                    checkout_total = totalCheckout,
                    created_at     = DateTime.Now,
                };
                checks.Add_Checkout(itemCheckout);
                #endregion
            }
            catch (Exception)
            {
                throw;
            }

            cartItem        = new List <ProductForCart>();
            Session["cart"] = null;
            return(Json(new { content = "" }));
        }