using System;

public class Program

{

    public static void Main()

    {

        ClassOne obj = new ClassOne();

        Console.WriteLine(obj.i);

        if(obj.i == null)

            Console.WriteLine("i is equal to Null");

        Nullable<int> j;

        Console.WriteLine(j); // Try to comment this row

    }

}

​

class ClassOne

{

    public Nullable<int> i;

}