using System;

public class Program

{

    public static void Main()

    {

        var myString = "hello people of earth";

        var myStringAgain = "hello people of earth";

        string nullString = null;

        bool stringsMatch = myString.Equals(myStringAgain);

        //bool stringsMatch2 = nullString.Equals(myStringAgain);

        bool nullStringMatches = string.Equals(nullString, myString, StringComparison.InvariantCultureIgnoreCase);

        Console.WriteLine(myString);

        Console.WriteLine(myStringAgain);

        Console.WriteLine("Strings match: " + stringsMatch);

        Console.WriteLine("Null string match:" + nullStringMatches);

    }

}