title: Remove xmlns attribute from xml
body: <p>In below xml, I tried to delete xmlns attribute but, its unable to populate under,
  xmlNode.Attributes still appear under outerxml and final xmldocument.</p>
  
  <pre><code>... 
  &lt;z:Datac knid="2" xmlns="http://services/api/"&gt;&lt;/z:Datac&gt;
  ...
  &lt;z:Datac knid="3" xmlns="http://services/api/"&gt;&lt;/z:Datac&gt;
  ....
  &lt;z:Datac knid="5" xmlns="http://services/api/"&gt;&lt;/z:Datac&gt;
  ....
  </code></pre>
  
  <p>How to remove xmlns attribute for each z:Datac element.</p>
  
  <pre><code>foreach (var item in nodes)
                      {
                          var xmlnsAttribute = (item.Attributes has "xmlns" attribute)
                          if (xmlnsAttribute != null)
                          {
                              Remove xmlNode...  //not able to reach here as not able to find xmlns.
                          }
  }
  </code></pre>
  
  <p>don't have xml.linq</p>