using System;

public class emp{

    public string x {get; set;}

​

}

public class Program

{

    public static void abc(ref emp e){e.x = "nit";}

    public static void def(emp e) { e.x ="kum";}

    public static void Main()

    {

        emp ee = new emp();

        ee.x = "nits";

        Console.WriteLine(ee.x);

        abc(ref ee);

        Console.WriteLine(ee.x);

        def(ee);

        Console.Write(ee.x);

    }

}