title: Update value in xml file
body: <p>I have a xml-file:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8" standalone="yes"?&gt;
  &lt;root&gt;
    &lt;level&gt;
      &lt;node1 /&gt;
      &lt;node2 /&gt;
      &lt;node3 /&gt;
    &lt;/level&gt;
  &lt;/root&gt;
  </code></pre>
  
  <p>What is the simplest way to insert values in node1, node2, node3 ?</p>
  
  <p>C#, Visual Studio 2005</p>