title: GetElementById() not finding the tag?
body: <p>I have a valid XML file being read by the following .NET C# windows service.
  The tag in question (u1_000) is absolutely in the element:</p>
  
  <pre><code>&lt;book id="u1_000" category="xyz"&gt; 
  </code></pre>
  
  <p>Is there some reason the GetElementById() does not find the Book element with the tag? - thanks</p>
  
  <pre><code>XmlDocument doc = new XmlDocument();
  doc.Load("C:\\j.xml");
  XmlElement ee = doc.GetElementById("U1_000");
  
  &lt;book id="U1_000" category="web"&gt; 
  </code></pre>