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copied!<p>There are a couple of issues here:</p> <ul> <li>How to cause ASP.NET to start returning data as soon as each item is available,</li> <li>How to coordinate the client & server, so that the client knows that a new item is available (i.e. so it can parse each item in the response separately, or so it can request more data if you're looking for 'pull')</li> </ul> <p>As explained in AlexK's answer, the <code>async</code> api does not alter the way the server responds to the client. Async only allows for your app to free-up threads when they're not in use, and makes it easier to parallelize portions of requests that depend on multiple resources.</p> <p>Besides using SignalR, which is designed for this, you can use the built-in lower-level mechanism - <a href="http://msdn.microsoft.com/en-us/library/system.net.http.pushstreamcontent%28v=vs.118%29.aspx" rel="nofollow">PushStreamContent</a> - yourself. Here are a couple of blog posts on how to do that:</p> <ul> <li><a href="http://blogs.msdn.com/b/henrikn/archive/2012/04/23/using-cookies-with-asp-net-web-api.aspx" rel="nofollow">Original announcement from the ASP.Net team</a> including some demo code - scroll down to "Push Content"</li> <li><a href="http://www.strathweb.com/2012/05/native-html5-push-notifications-with-asp-net-web-api-and-knockout-js/" rel="nofollow">Native HTML5 push notifications with ASP.NET Web API and Knockout.js</a>, includes example of <strong>the client side (in a browser)</strong>. Also related - <a href="http://www.strathweb.com/2013/01/asynchronously-streaming-video-with-asp-net-web-api/" rel="nofollow">Asynchronously streaming video with ASP.NET Web API</a></li> <li><a href="http://weblogs.asp.net/andresv/archive/2012/12/12/asynchronous-streaming-in-asp-net-webapi.aspx" rel="nofollow">Asynchronous Streaming in ASP.NET WebApi</a></li> </ul>

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