title: How to add only xmlns="http://url.com" to an xml file in C#?
body: <p>I am having a horrible time trying to get this to work.  I have an existing XML file, and I simply need to add xmlns="http://url.com/path_v1_0" to an existing tag (the url.com is arbitrary, I have something else I need to put in there instead).  This needs to be in C#.  The rest of the file needs to stay exactly as it is, just the xmlns piece needs to be added.</p>
  
  <p>Here is a snippet of what I have:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;content&gt;
    &lt;block id="root"&gt;
      &lt;identification&gt;
  </code></pre>
  
  <p>here is a snippet of what I need:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;content xmlns="http://url.com/path_v1_0"&gt;
    &lt;block id="root"&gt;
      &lt;identification&gt;
  </code></pre>