title: How to check XMLNode is exist or not in Windows Phone
body: <p>I am writing Windows Phone 8 application, and I am getting XML data from web service,in some response, in my XML document I am getting some "Tags" and in other response I do not getting those tags, so how do I check that XNode is exist or not?
  See my XML document below:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;root&gt;
     &lt;Group&gt;
       &lt;Id&gt;205647&lt;/Id&gt;
       &lt;Name&gt;Docs&lt;/Name&gt;
     &lt;/Group&gt;
  
     &lt;Group&gt;
      &lt;Id&gt;205648&lt;/Id&gt;
      &lt;Name&gt;Photos&lt;/Name&gt;
     &lt;/Group&gt;
  &lt;/root&gt;
  </code></pre>
  
  <p>Now, in above document, the Descendant "GROUP" is exist in some results and doesn't exist in other results,How do I check that?</p>