using System;

public class Program

{

    public static void Main()

    {

        int? i = 42;

        Console.WriteLine(i.GetType().Name);

        i = null; // and now: empty

        try {

            Console.WriteLine(i.GetType().Name);

        } catch (NullReferenceException) {

            Console.WriteLine("NRE");

        }

    }

}