HttpContext (C#) : HTTP Modules « Development « ASP.NET Tutorial

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2. Development
3. HTTP Modules

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;

namespace Demo
{
    public class AppendMessage : IHttpModule
    {
        private HttpContext _current = null;

        #region IHttpModule Members

        public void Dispose()
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public void Init(System.Web.HttpApplication context)
        {
            _current = context.Context;

            context.PreSendRequestContent +=
                new EventHandler(context_PreSendRequestContent);
        }

        void context_PreSendRequestContent(object sender, EventArgs e)
        {
            string message = "<!-- This page has been post processed at " +
                             System.DateTime.Now.ToString() +
                             " by a custom HttpModule.-->";

            _current.Response.Output.Write(message);
        }

        #endregion
    }
}
File: Web.config


 
<configuration>
    <system.web>
      <httpModules>
        <add name="AppendMessage" type="AppendMessage, App_code" />
      </httpModules>
    </system.web>
</configuration>