using System;

public class Program

{

    public static void Main()

    {

        var blah = new Blah();

        Console.WriteLine("Not nullable " + blah.NotNullable.ToString());

        Console.WriteLine("Nullable " + blah.IsNullable.ToString());

    }

    class Blah

    {

        public bool NotNullable {get; set;}

        public bool? IsNullable { get; set; }

    }

}