Introduction to Events

using System;
using System.Drawing;
using System.Windows.Forms;
// custom delegate
public delegate void StartDelegate();
class EventDemo : Form
{
    // custom event
    public event StartDelegate StartEvent;
    public EventDemo()
    {
        Button clickMe = new Button();
        clickMe.Parent = this;
        clickMe.Text = "Click Me";
        clickMe.Location = new Point((ClientSize.Width - clickMe.Width) /2,(ClientSize.Height - clickMe.Height)/2);
        // an EventHandler delegate is assigned
        // to the button's Click event
        clickMe.Click += new EventHandler(OnClickMeClicked);
        // our custom "StartDelegate" delegate is assigned
        // to our custom "StartEvent" event.
        StartEvent += new StartDelegate(OnStartEvent);
        // fire our custom event
        StartEvent();
    }
    // this method is called when the "clickMe" button is pressed
    public void OnClickMeClicked(object sender, EventArgs ea)
    {
        MessageBox.Show("You Clicked My Button!");
    }
    // this method is called when the "StartEvent" Event is fired
    public void OnStartEvent()
    {
        MessageBox.Show("I Just Started!");
    }
    static void Main(string[] args)
    {
        Application.Run(new EventDemo());
    }
}