title: XDocument says Data at the root level is invalid?
body: <p>I'm trying to parse an XML, which is at this <a href="https://gdata.youtube.com/feeds/api/users/djfonplaz/subscriptions?v=2" rel="nofollow">url</a>:</p>
  
  <pre><code>try
  {
      var xDoc = XDocument.Parse(requestedURL);
      Response.Write("asd: " + xDoc.Descendants("entry").Count());
  }
  catch (Exception err)
  {
      Response.Write(err.Message);
  }
  </code></pre>
  
  <p>but it replies with <code>Data at the root level is invalid. Line 1, position 1.</code></p>
  
  <p>Where am I wrong?</p>