Use ref to mark an object parameter

   
 

using System;

public class XInt {
    public int iField = 2;
}

public class Starter {

    public static void MethodA(ref XInt alias) {
        XInt inner = new XInt();
        inner.iField = 5;
        alias = inner;
    }

    public static void Main() {
        XInt obj = new XInt();
        MethodA(ref obj);
        Console.WriteLine(obj.iField); // 5
    }
}