public static void GetPrice(CartItem product)
 {
     Console.WriteLine("Price per product?");
     product.Price = InputValidation.ParsePrice();
 }
 public static void GetName(CartItem product)
 {
     Console.WriteLine("Enter a product you wish to purchase.");
     product.Name = InputValidation.IsNameNull();
 }
 public static void GetQuantity(CartItem product)
 {
     Console.WriteLine("Quantity?");
     product.Quantity = InputValidation.ParseQuantity();
 }