title: Show xml nodes in textblock
body: <p>I want to display the content of an xml node in a Textblock. Here is the XML:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  
  
  &lt;Hilfe&gt;
  &lt;Hilfeartikel&gt;
  &lt;Frage&gt;Wie lange dauert es bis ein Ticket bearbeitet wird?&lt;/Frage&gt;
  &lt;Antwort&gt;Test&lt;/Antwort&gt;
  &lt;/Hilfeartikel&gt;
  
  &lt;Hilfeartikel&gt;
  &lt;Frage&gt;&lt;/Frage&gt;
  &lt;Antwort&gt;&lt;/Antwort&gt;
  &lt;/Hilfeartikel&gt;
  &lt;/Hilfe&gt;
  </code></pre>
  
  <p>And this was my try:  </p>
  
  <pre><code>XmlDocument doc = new XmlDocument();
  doc.LoadXml(File.ReadAllText(@"Z:\hilfexml.xml"));
  </code></pre>
  
  <p>But i can not use the attributes. I try to google for it but didn't find anything. So i hope someone can help me. I always get a null reference exception. The null reference exeption only occurs when i try to do something with the values of the nodes. It allways stays in the root element.</p>