public ActionResult AddToShoppingCartCommand(int productId, int quantity = 1)
{
var cart = RetrieveCurrentShoppingCart();
cart = _service.AddProductToShoppingCart(cart, productId, quantity);
SaveCurrentShoppingCart(cart);
// PRG (Post-Redirect-Get) pattern to avoid F5 refresh issues
// (and also key step to neatly separate Commands from Queries in the future)
return(RedirectToAction("AddTo"));
}
