public UserCart AddProduct(int productId)
        {
            UserDetail userDetail = GetUserDetail();
            UserCart   userCart   = _cartRepo.GetCartByUserId(userDetail.UserId);
            Product    product    = ProductRepository.getProductRepository().GetProdutcById(productId);

            userCart.AddProduct(product);
            _cartRepo.UpdateCart(userCart);
            return(userCart);
        }