using System;

public class Program

{

    public static void Main()

    {

        string strA = null;

        Console.WriteLine(strA == null); // true

        Console.WriteLine("\n\n-------------Separator-----------------\n\n");

        // Attempting to call methods or properties on strA throws a NullReferenceException. 

        Console.WriteLine(strA.Length);

​

    }

}