Creating Custome controls with Custome events

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C#

Hi Guys,
In all the blogs i read how to raise custom events, by calling <EventName>(<senderObject>,<eventArguments>) in a child control's postback event like, Button_Click events and etc..., in user control. But I want raise this event without calling in any child control's postback event.
Please guide me. Just I am thinking that, if we call our custom event <EventName>(<senderObject>,<eventArguments>) in any child control's postback, no use of it. Instead of this, directly we can write our code in Child controls postback event. Then what is the use of custom events?
I read the sameples like, developed a user control

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MySamples
{
    public delegate void customDeligate(object sender, CustomArgs args);
    public class MyClass
    {
        public event customDeligate customEvent;
        protected virtual void OnCustomEvent(CustomArgs e)
        {
            if (customEvent != null)
                customEvent(this, e);
        }
        protected void OnCustomEvent(object sender, CustomArgs e)
        {
            if (customEvent != null)
                customEvent(sender, e);
        }
    }
    public class CustomArgs : EventArgs
    {
        string _msg;

        public string Message
        {
            get { return _msg; }
            set { _msg = value; }
        }
        public CustomArgs(string message)
            : base()
        {
            this._msg = message;
        }
        public CustomArgs()
            : base()
        {
        }
    }
 public partial class Wall_Papers : System.Web.UI.UserControl
 {
    
        protected void Page_Load(object sender, EventArgs e)
        {
            MyClass objClass = new MyClass();
            objClass.customEvent += new customDeligate(objClass_customEvent);
            
        }

        static void objClass_customEvent(object sender, CustomArgs args)
        {
            Response.Write("Hi Welcome to Custome Events");
        }
    }
}

How can I raise my event, without using any postback child controls like button,dropdown etc., I want create my own control which is working as Regular controls.

Thanks & Regards
Chaitanya