title: Reading and writing an existing xml file c# 3.0 / .net3.5
body: <p>I have a xml-file which I want to read. How can I do it? I would not load whole xml file at runtime </p>
  
  <pre><code>(XmlDocument _xd = XmlDocument.Load(path)) 
  </code></pre>
  
  <p>I want to do it with Readers, but I can not achieve with it.</p>
  
  <p>At the same time I want to add nodes to this xml-file with writers. How do these work with XDocument or at c# 3.5.</p>
  
  <p>Kind Regards. </p>