using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

​

    //Example code only

    public void NonBlocking_event_driven()

    {

        var ob = Observable.Create<string>(observer =>

        {

            var timer = new System.Timers.Timer();

            timer.Interval = 1000;

            timer.Elapsed += (s, e) => observer.OnNext("tick");

            timer.Elapsed += OnTimerElapsed;

            timer.Start();

            return Disposable.Empty;

        });

        var subscription = ob.Subscribe(Console.WriteLine);

        Console.ReadLine();

        subscription.Dispose();

    }

​

    private void OnTimerElapsed(object sender, ElapsedEventArgs e)

    {

        Console.WriteLine(e.SignalTime);

    }

}