public ActionResult AchatComplet()
        {
            ShoppingCart cart = ShoppingCart.GetCart(this.HttpContext);

            ShoppingCartViewModel viewModel = new ShoppingCartViewModel
            {
                CartItems = cart.GetCartItems(),
                CartTotal = cart.GetTotal(),
            };
            ViewBag.Total = cart.GetTotal();
            //foreach (var c in cart.GetCartItems())
            //{
            //    storeDB.Achat.Add(c);
            //}
            storeDB.SaveChanges();
            return View(viewModel);
        }
        public ActionResult Index()
        {
            ShoppingCart cart = ShoppingCart.GetCart(this.HttpContext);

            ShoppingCartViewModel viewModel = new ShoppingCartViewModel
            {
                CartItems = cart.GetCartItems(),
                CartTotal = cart.GetTotal(),
            };
            ViewBag.Total = cart.GetTotal();

            return View(viewModel);
        }