public ShoppingCartRemoveViewModel AddToCart(int productId, string cartId)
        {
            ShoppingCartRemoveViewModel viewModel = new ShoppingCartRemoveViewModel();

            viewModel.ItemCount = cartRepository.AddToCart(productId, cartId);
            var addedItem = productRepository.FindById(productId);

            viewModel.Message   = addedItem.Name + " has been added to your shopping cart.";
            viewModel.DeleteId  = productId;
            viewModel.CartCount = cartRepository.GetCount(cartId);
            viewModel.CartTotal = cartRepository.GetTotal(cartId);
            return(viewModel);
        }