using System;

​

public class Program

{

    public static void Main()

    {

        var a = new object();

        Change(ref a);

        if (a == new object()) {

            Console.Write("this line will never be reached");

        }

        Console.Write("object hasn't equals method implemented and isn't a structure");

    }

    public static void Change(ref object a){

        return;

    }

}

​