c sharp classes

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StringManipulationPost
{
    class Program
    {
        static void Main(string[] args)
        {
          
            string string1 = "hello";
       string string2 = "good bye";
       string string3 = "Happy Birthday";
       string string4 = "happy birthday";

       Console.WriteLine( "string1 = \"" + string1 + "\"" +
          "\nstring2 = \"" + string2 + "\"" +
         "\nstring3 = \"" + string3 + "\"" +
          "\nstring4 = \"" + string4 + "\"\n" );

       // test for equality using Equals method
       if ( string1.Equals( "hello" )  )
         Console.WriteLine( "string1 equals \"hello\"" );
      else
          Console.WriteLine( "string1 does not equal \"hello\"" );

      // test for equality with ==
     if ( string1 == "hello" )
        Console.WriteLine( "string1 equals \"hello\"" );
       else
          Console.WriteLine( "string1 does not equal \"hello\"" );
            // test for equality comparing case
       if ( string.Equals( string3, string4 )  ) // static method
         Console.WriteLine( "string3 equals string4" );
       else
          Console.WriteLine( "string3 does not equal string4" );


string1.Equals( "hello" );
//string1 == "hello";
string.Equals( string3, string4 );



Console.ReadLine();


 
        }
    }
}