Using Initializers
public class Product { public string make = "Ford"; public string model = "T"; public string color; // default value of null public int yearBuilt = 1910; public void Start() { System.Console.WriteLine(model + " started"); } public void Stop() { System.Console.WriteLine(model + " stopped"); } } class MainClass { public static void Main() { Product myProduct = new Product(); System.Console.WriteLine("myProduct.make = " + myProduct.make); System.Console.WriteLine("myProduct.model = " + myProduct.model); if (myProduct.color == null) { System.Console.WriteLine("myProduct.color is null"); } System.Console.WriteLine("myProduct.yearBuilt = " + myProduct.yearBuilt); } }