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    <p>It looks to me, from your example, like you're doing all the work before the "Begin" call finishes; that's a common mistake I found while learning the async pattern. </p> <p>Though I'm not familiar with its application in WCF, the Async model more typically is a Begin method that launches some new thread with a <code>IAsyncResult</code> object to be updated by that new thread. To "complete" the action, when <code>IsCompleted</code> is set to <code>true</code>, the original caller is expected to pass the original <code>IAsyncResult</code> object back to the corresponding End method which returns the result. A trivial implementation looks as follows:</p> <pre><code> static Func&lt;string&gt; getUser; public static IAsyncResult BeginGetUser(AsyncCallback callback, object state) { getUser = () =&gt; { Thread.Sleep(2000); return "finished"; }; return getUser.BeginInvoke(callback, state); } public static string EndGetUser(IAsyncResult asyncResult) { return getUser.EndInvoke(asyncResult); } </code></pre> <p>The calls to it might look like:</p> <pre><code>var result = BeginGetUser(null, null); string value = EndGetUser(result); </code></pre> <p>Of course, this is a trivial case: to quote <a href="http://kennyw.com/work/indigo/258" rel="nofollow">http://kennyw.com/work/indigo/258</a>, "If you aren’t doing something that’s "natively async", then you shouldn’t be using AsyncPattern=true".</p> <p>Fortunately, with C# 5.0 or the Async CTP that Microsoft released, the .Net async pattern may become a thing of the past.</p>
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    1. POWCF REST Not Processing Asynchronously
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    1. USMatt DeKrey
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    1. COSorry, it's been awhile and I'm just coming back to a few bits of code that haven't been fixed. This makes sense to me, however, since we're calling them via ajax from a browser, we can't call Begin/End methods separately.
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      1. USjaryd
    2. CO@phreak3eb as you only need to decorate the begin method with the `OperationContract(Attribute)`-attribute, only a `GetUser`-method will get published. the main thing here is that the `AsyncPattern = true` is mainly for interest to the hosting process. it will help IIS (or any other hosting process) to free the thread, which does processing the request, to serve any other request. as soon as the action is completed, the hosting process will aquire another thread to end the complete circle.
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      1. USAndreas Niedermair
 

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