using System;

using Microsoft.VisualStudio.TestTools.UnitTesting;

public class Program

{

    public static void Main()

    {

        Foo bar = new Foo();

        bar.a=2;

        Foo test = Random(bar);

        Assert.AreNotSame(test, bar);

        Console.WriteLine(test.a);

    }

    public static Foo Random(Foo bar){

        bar.a=1;

        return bar;

    }

}

​

public class Foo{

    public int a;

    public string test;

}