using System;

using System.Threading.Tasks;

public class Program {

    class C {}

    interface I {

        public void PrintID();

    }

    struct S : I {

        public string id;

        C c;

        public S(C c, string id){

            this.id = id;

            this.c = c;

        }

        public void PrintID(){

            Console.WriteLine(string.Format("My ID = {0} and my c = {1}", id, c));

        }

    }

    public static void Main() {

        C c = new C();

        S s = new S(c, "default");

        s.id = "foo";

        ExecuteInTime(100, s.PrintID); //id == foo

        //ExecuteInTime(100, () => s.PrintID()); //id == bar

        s.id = "bar";

        // prevent Main() from exiting

        ExecuteInTime(500, () => {}).Wait();

    }

    public static async Task ExecuteInTime(int delay, Action callback) {

        await Task.Delay(delay);

        callback();

    }

}