using System;

public class Program

{   

    public static void Main()

    {

        var program = new Program();

        program.Run();

    }

    public void Run()

    {

        var str = "Hello";

        Console.WriteLine("Run::Before change: " + str);

        ChangeString(str);      

        Console.WriteLine("Run::After change: " + str);

    }

    public void ChangeString(string s)

    {

        Console.WriteLine("ChangeString::Before change: " + s);

        s = "Changed";

        Console.WriteLine("ChangeString::After change: " + s);

    }

}