<%@ WebHandler Language="c#" class="XSPTest.AsyncTest" debug="true" %> using System; using System.Web; using System.Threading; namespace XSPTest { public class AsyncTest : IHttpAsyncHandler { EventHandler evt; HttpContext context; void Func (object o, EventArgs args) { context.Response.Write ("In async callback\n"); context.Response.ContentType = "text/plain"; } public void ProcessRequest (HttpContext context) { throw new Exception ("Should not be called"); } public IAsyncResult BeginProcessRequest (HttpContext context, AsyncCallback cb, object state) { this.context = context; evt = new EventHandler (Func); return evt.BeginInvoke (null, null, cb, state); } public void EndProcessRequest (IAsyncResult ares) { context.Response.Write ("End request being invoked."); } public bool IsReusable { get { return false; } } } }