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    <p>Here's a sample I wrote that you could try:</p> <p>Controller:</p> <pre><code>public class HomeController : AsyncController { public ActionResult Index() { return View(); } public void SomeTaskAsync(int id) { AsyncManager.OutstandingOperations.Increment(); Task.Factory.StartNew(taskId =&gt; { for (int i = 0; i &lt; 100; i++) { Thread.Sleep(200); HttpContext.Application["task" + taskId] = i; } var result = "result"; AsyncManager.OutstandingOperations.Decrement(); AsyncManager.Parameters["result"] = result; return result; }, id); } public ActionResult SomeTaskCompleted(string result) { return Content(result, "text/plain"); } public ActionResult SomeTaskProgress(int id) { return Json(new { Progress = HttpContext.Application["task" + id] }, JsonRequestBehavior.AllowGet); } } </code></pre> <p>View:</p> <pre><code>&lt;script type="text/javascript"&gt; $(function () { var taskId = 543; $.get('/home/sometask', { id: taskId }, function (result) { window.clearInterval(intervalId); $('#result').html(result); }); var intervalId = window.setInterval(function () { $.getJSON('/home/sometaskprogress', { id: taskId }, function (json) { $('#progress').html(json.Progress + '%'); }); }, 5000); }); &lt;/script&gt; &lt;div id="progress"&gt;&lt;/div&gt; &lt;div id="result"&gt;&lt;/div&gt; </code></pre> <p>The idea is to start an asynchronous operation that will report the progress using <code>HttpContext.Application</code> meaning that each task must have an unique id. Then on the client side we start the task and then send multiple AJAX requests (every 5s) to update the progress. You may tweak the parameters to adjust to your scenario. Further improvement would be to add exception handling.</p>
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    1. COThanks Darin, I tried your code but still get all of the requests 'backing up' after one another. Having spent this morning slowly trawling for an answer I'm now starting to think that this could be related to Session not allowing multiple requests simultaneously, forcing requests to be synchronous. One change I had to make was your use of Task.Factory since I'm currently working in .NET 3, not 4. Do you think Task.Factory would resolve the Session locking problem?
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    2. COAdditionally I have just got your code running and I did it by removing any code in my controller that refers to Session, so that's obviously my problem. Unfortunately my controllers all require various bits of data I'm holding in Session (and retrieved within a BaseController that they all extend) so I can't see any simple way around that problem.
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    3. COThe Session is not always available in asynchronous actions.
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