using System;

public class Program

{

    public static void Main()

    {

        string test = "test";

        Participant p = new Participant("Isai");

        Console.WriteLine("input string: "+test);

        Console.WriteLine("input object: "+p.Name);

        NP(p);

        X(test);

        Console.WriteLine("input string: "+test);

        Console.WriteLine("input object: "+p.Name);

        NPR(ref p);

        XR(ref test);

        Console.WriteLine("input string: "+test);

        Console.WriteLine("input object: "+p.Name);

    }

    public static void NP (Participant old){

        old = new Participant("new");

    }

    public static void X (string input){

        input = "not izzi";

    }

    public static void NPR (ref Participant old){

        old = new Participant("new");

    }

    public static void XR (ref string input){

        input = "not izzi";

    }

}

​

public class Participant {

    public string Name = "";

    public Participant(){

    }

    public Participant(string name){

        Name = name;

    }

}