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&lt;p&gt;I used your suggestion in my solution, but every time I have an error in my service, he ever pass in the first &amp;quot;if&amp;quot; (if (arg.Error !=null)) in my event &amp;quot;Completed&amp;quot; in client layer. And debugging the method of the service generated in my client, I saw that the out parameter doesn&amp;#39;t receive any value, because the error occurs before.&lt;/p&gt;
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&lt;div style="clear:both;"&gt;&lt;/div&gt;&lt;img src="http://msmvps.com/aggbug.aspx?PostID=1696846" width="1" height="1"&gt;</description></item><item><title>re: Returning exception information to a Silverlight client through WCF</title><link>http://msmvps.com/blogs/theproblemsolver/archive/2009/01/27/returning-exception-information-to-a-silverlight-client-through-wcf.aspx#1695384</link><pubDate>Mon, 15 Jun 2009 00:41:45 GMT</pubDate><guid isPermaLink="false">d67277c4-116b-43f1-b688-e9ef184ea916:1695384</guid><dc:creator>Rick</dc:creator><description>&lt;p&gt;We are also using out but instead we are returning enum type and each flag has its own definition defined under resource file. Silverlight apps gets the flag as per flag as a key.&lt;/p&gt;
&lt;div style="clear:both;"&gt;&lt;/div&gt;&lt;img src="http://msmvps.com/aggbug.aspx?PostID=1695384" width="1" height="1"&gt;</description></item><item><title>re: Returning exception information to a Silverlight client through WCF</title><link>http://msmvps.com/blogs/theproblemsolver/archive/2009/01/27/returning-exception-information-to-a-silverlight-client-through-wcf.aspx#1695113</link><pubDate>Fri, 12 Jun 2009 17:49:53 GMT</pubDate><guid isPermaLink="false">d67277c4-116b-43f1-b688-e9ef184ea916:1695113</guid><dc:creator>Assaf</dc:creator><description>&lt;p&gt;Thank you for this article. Saved me a lot of time.&lt;/p&gt;
&lt;p&gt;In case anyone needs to do this in VB,&lt;/p&gt;
&lt;p&gt;To create an output parameter in VB.Net, add the&lt;/p&gt;
&lt;p&gt;&amp;lt;System.Runtime.InteropServices.Out()&amp;gt; attribute before the parameter definition:&lt;/p&gt;
&lt;p&gt;&amp;lt;OperationContract()&amp;gt; _&lt;/p&gt;
&lt;p&gt;Public Function MyMethod( _&lt;/p&gt;
&lt;p&gt; &amp;nbsp;ByVal param1 As Short, _&lt;/p&gt;
&lt;p&gt; &amp;nbsp;&amp;lt;System.Runtime.InteropServices.Out()&amp;gt; ByRef fault As ApplicationFault) As ReturnType&lt;/p&gt;
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