private void AddToCart() { int quantity = int.Parse(Quantity); // If true, update quantity on the item already in the cart if (ShoppingCartHelper.IsAlreadyInCart(Product, SelectedSize.Size)) { ShoppingCartHelper.UpdateItemQuantity(Product.ProductId, SelectedSize.Size, quantity); return; } var productVM = new ProductViewModel { ProductId = Product.ProductId, Name = Product.Name, Description = Product.Description, ImageUrl = Product.ImageUrl, Quantity = quantity, Size = SelectedSize.Size, Cost = SelectedSize.Cost * quantity }; ShoppingCartHelper.AddToCart(productVM); }