How can you write events for the server controls?

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
namespace WebCustomControl1
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
    public class WebCustomControl1 : WebControl,IPostBackEventHandler
    {
        // Defines the Click event.
        public event EventHandler Click;
 
        //Invoke delegates registered with the Click event.
        protected virtual void OnClick(EventArgs e)
        {
 
            if (Click != null)
                        {
                Click(this, e);
                        }
        }
 
        // Define the method of IPostBackEventHandler that raises change events.
            public void RaisePostBackEvent(string eventArgument)
            {
                        OnClick(new EventArgs());
                }
 
            protected override void Render(HtmlTextWriter output)
            {
                    output.Write("<INPUT TYPE = submit name = " + this.UniqueID +  " Value = ’Click Me’ />");
                }
 
        }
}