using System;

using System.Threading;

using System.Threading.Tasks;                   

​

public class Program

{

    public static int counter = 0;

    public static void Main()

    {

         var rack = new Rack();

            rack.ButtonPushed += OnButtonPushed;

            rack.Initialise();

        Thread.Sleep(50);

        Console.WriteLine(counter);

    }

​

​

        private static void OnButtonPushed(object sender, EventArgs e)

        {

            counter++;

        }

​

        class Rack {

            public event EventHandler ButtonPushed;

            public void Initialise()

            {

                Task.Run(() =>

                {

                    while (true)

                    {

                       Task.Delay(10);

                        ButtonPushed.Invoke(this, null);

                    }

                });

            }

        }

}