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    <p>With the apparent lack of built-in support for IHttpAsyncHandler timeouts, presumably you must manage your own timeout. Perhaps this is by design; after all you are choosing an asynchronous pattern - who does MSFT think they are trying to set a default timeout for your long running task?</p> <p>What I would do is use <a href="http://msdn.microsoft.com/en-us/library/system.threading.threadpool.registerwaitforsingleobject.aspx" rel="nofollow">ThreadPool.RegisterWaitForSingleObject</a> to manage your polling with an appropriate timeout. Here is a code sample I use to avoid waiting on a web service that never returns:</p> <pre><code>private const int REQUEST_TIMEOUT = 30000; // miliseconds (30 sec) private void CallService() { try { string url = "somewebservice.com"; WebRequest request = WebRequest.Create(url); // Asynchronously fire off the request IAsyncResult result = request.BeginGetResponse(new AsyncCallback(MyRoutineThatUsesTheResults), request); // Handle timed-out requests ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(RequestTimeout), request, REQUEST_TIMEOUT, true); } catch (Exception ex) { _logger.Error("Error during web service request.", ex); } private void RequestTimeout(object state, bool timedOut) { if (timedOut) { WebRequest request = (WebRequest)state; _logger.WarnFormat("Request to {0} timed out (&gt; {1} sec)", request.RequestUri.ToString(), REQUEST_TIMEOUT / 1000); request.Abort(); } } </code></pre> <p>You will need an IAsyncResult to work with this approach but that's an established pattern you shouldn't have trouble running down samples about.</p> <p>Also, you will run into issues when IIS decides to recycle your app pool / tear down your app domain while your polling is still running. If that's a condition you want to handle, you can use <a href="http://haacked.com/archive/2011/10/16/the-dangers-of-implementing-recurring-background-tasks-in-asp-net.aspx" rel="nofollow">HostingEnvironment.RegisterObject</a>.</p>
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