using System;

public class Program

{

    public static void Main()

    {

        string strA = null;

        string strB = "developer";

​

        // If first string is null and you try to invoke .Equals() method on it, an exception of type NullReferenceException is thrown 

        Console.WriteLine(strA.Equals(strB)); // Throws Exception

        // Comment above line to run the below code

        // Instead, use static String.Equals method or == operator for comparing Strings because both are null-safe.

        Console.WriteLine(String.Equals(strA, strB)); // No Exception

        Console.WriteLine(strA==strB); // No Exception

​

​

    }

}