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    <p>Microsoft says that you always have to close the connection at the end (see the <a href="http://msdn.microsoft.com/en-us/library/ms751475%28v=vs.90%29.aspx" rel="nofollow noreferrer">example</a> at MSDN). I've found the following pattern in this <a href="http://www.codeproject.com/Articles/74129/The-Proper-Use-and-Disposal-of-WCF-Channels-or-Com" rel="nofollow noreferrer">article about WCF disposal handling</a>:</p> <pre><code>WCFServiceClient c = new WCFServiceClient(); try { c.HelloWorld(); } catch { // acknowledge the Faulted state and transition to Closed c.Abort(); // handle or throw throw; } finally { c.Close(); } </code></pre> <p>The article says you should <strong>avoid</strong> <code>using</code> since it does not properly close and dispose the WCF service client object, you should do it with a <code>try ... catch ... finally</code> block instead as shown above - this way you're dealing with exceptions (which will abort and then re-throw or handle the exception) and also you take care of finally closing the connection. This is also clearly stated in <a href="http://msdn.microsoft.com/en-us/library/aa355056%28v=vs.90%29.aspx" rel="nofollow noreferrer">Microsoft's WCF troubleshooting hints.</a></p> <p><strong>Note:</strong> The <code>c.Close()</code> in the <code>finally</code> does not do any harm in case of an exception (faulted state), because we call <code>c.Abort()</code> before the exception is re-thrown so the <code>c.Close()</code> does actually nothing in this case. However, if no exception occurs, then <code>c.Close()</code> is actually executed normally and the connection closes as expected.</p> <p>If your <strong>WCF service</strong> behaves in a strange way, there are many (other) things which could cause this - <a href="https://stackoverflow.com/a/12800645/1016343">here</a> you can find some debugging hints.</p>
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