title: how can I get the first element of a XElement
body: <p>how can I get the first element</p>
  
  <pre><code>&lt;outline title="Javascript" text="Javascript"&gt; &lt;/outline&gt;
  </code></pre>
  
  <p>from this XElement</p>
  
  <pre><code>&lt;outline title="Javascript" text="Javascript"&gt;
   &lt;outline text="j" title="j" type="rss" xmlUrl="http://wwww.Java.com/rss2.xml"/&gt;
  &lt;/outline&gt;
  </code></pre>
  
  <p>this is my code</p>
  
  <pre><code>var desireXElement =existXElement.Where(w =&gt; (string) w.Attribute("title") == "Javascript").FirstOrDefault();
  </code></pre>