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    <p>The XML of a Component in Tridion is of the following format:</p> <pre><code>&lt;Content xmlns="uuid:2607D20D-1B22-4994-98C1-66D9ACF85C20"&gt; &lt;first&gt;The value of my first field&lt;/first&gt; &lt;second&gt;The value of my second field&lt;/second&gt; &lt;/Content&gt; </code></pre> <p>Your relevant code snippet is:</p> <pre><code>var element = xdoc.Elements("first").Single(); </code></pre> <p>This is failing to select an element, since it is:</p> <ol> <li>not providing a namespace to the selection</li> <li>only selecting direct children of the document root</li> </ol> <p>You seem to expect that the default namespace will be automatically selected if you don't specify a namespace, which simply is not true. As soon as you have XML that deals with namespaces, every query will have to specify the correct namespace. </p> <p>If you modify the code to deal with these two issues, it should look something like this:</p> <pre><code>XNamespace ns = xdoc.Root.GetDefaultNamespace(); var element = xdoc.Descendants(ns+"first").Single(); </code></pre> <p>You might want to consider reading up on .NET handling of namespaces in XML and on XML namespaces in general, since this is a very common mistake that you simply need to get out of your system quickly.</p> <p>People who have wanted to update the Component XML through the Core Service before you found the helper class given <a href="http://code.google.com/p/tridion-practice/wiki/ChangeContentOrMetadata" rel="noreferrer">here</a> useful.</p> <p>In addition as Mihai points out the way you invoke <code>XDocument.Save</code> is wrong. It expects a file name as its parameter, while you are passing it the XML of your Component.</p>
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    1. USFrank van Puffelen
    1. USFrank van Puffelen
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    1. COThank you. Got so much information from the answer.
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