using System;
using System.Web;


    public class Moduletest : IHttpModule
    {

        public Moduletest()
        {
        }

        public String ModuleName
        {
            get { return "HelloWorldModule"; }
        }

        // In the Init function, register for HttpApplication 
        // events by adding your handlers.
        public void Init(HttpApplication application)
        {
            application.BeginRequest +=
                (new EventHandler(this.Application_BeginRequest));
            application.EndRequest +=
                (new EventHandler(this.Application_EndRequest));
        }

        private void Application_BeginRequest(Object source,
             EventArgs e)
        {
            // Create HttpApplication and HttpContext objects to access
            // request and response properties.
            HttpApplication application = (HttpApplication)source;
            HttpContext context = application.Context;
            string filePath = context.Request.FilePath;
            string fileExtension =
                VirtualPathUtility.GetExtension(filePath);
            if (fileExtension.Equals(".aspx"))
            {
                context.Response.Write("<h1><font color=red>" +
                    "HelloWorldModule: Beginning of Request" +
                    "</font></h1><hr>");
            }
        }

        private void Application_EndRequest(Object source, EventArgs e)
        {
            HttpApplication application = (HttpApplication)source;
            HttpContext context = application.Context;
            string filePath = context.Request.FilePath;
            string fileExtension =
                VirtualPathUtility.GetExtension(filePath);
            if (fileExtension.Equals(".aspx"))
            {
                context.Response.Write("<hr><h1><font color=red>" +
                    "HelloWorldModule: End of Request</font></h1>");
            }
        }

        public void Dispose() { }
    }

<?xml version="1.0"?>
<!--
  有关如何配置 ASP.NET 应用程序的详细信息，请访问
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.5"/>  
    <httpRuntime targetFramework="4.5"/>
    <httpModules>
      <add name="Moduletest" type="Moduletest"/>
    </httpModules> 
  </system.web>
</configuration>

protected void Page_Load(object sender, EventArgs e)
    {
        Response.Write("<br/><br/>来自Default.aspx页面<br/>");
    }