using System;

public class Program

{

    public static void Main()

    {

        Myclass myclass = new Myclass();

        myclass.mx = "12";

        myclass.my = "13";

        myclass.temp = myclass.mx ;

        myclass.mx = "22";

        Console.WriteLine("temp is:"+myclass.temp + ";x is:"+myclass.mx);

    }

}

​

public class Myclass

{

    public string mx;

    public string my;

    public string temp;

}