using System;

namespace Samples
{
    public delegate void CustomEventHandler(object sender, EventArgs e);

    class EventSample
    {
        public static void Sample()
        {
            Button button = new Button();
            button.Click += new CustomEventHandler(Button_Click);

            button.OnClick();
        }

        private static void Button_Click(object sender, EventArgs e)
        {
            System.Console.WriteLine("Button clicked!");
        }
    }
    
    class Button
    {
        public event CustomEventHandler Click;

        public void OnClick()
        {
            if (Click != null)
                Click(this, EventArgs.Empty);
        }
    }
}