static void Main(string[] args) { var product1 = new ConstructorYeah("Cat", 23m, 27); product1.Name = "Porcupine"; Debug.Assert(product1.Description == null, "There should be no decription!"); Console.WriteLine("Product one is {0} and it has a price of {1:c}", product1.Name, product1.Price); Console.ReadLine(); }