Help..XML Root Element Missing Exception (Visual C#)

[hvs69]

I am writing a little application in c# which requires application of XSL transform on a RSS feed from YouTube. Here is the relevant code

HttpWebRequest myreq = (HttpWebRequest)WebRequest.Create(UrlList[FeedPointer]);
                HttpWebResponse myrep = (HttpWebResponse)myreq.GetResponse();
                MemoryStream RSSOut = new MemoryStream(); 
               StreamReader mystream = new StreamReader(myrep.GetResponseStream(), Encoding.UTF8);
 
                try
                {
 
                    string outputstring;
                    outputstring = mystream.ReadToEnd();
                    RSSOut.Write(ASCIIEncoding.ASCII.GetBytes(outputstring), 0, outputstring.Length);
                    XPathDocument myXPathDoc = new XPathDocument(RSSOut);

I am getting the "XML Root Element Missing" exception while executing the last line of the code (XPathDocument Declaration).

If I dump the outputstring to the console, I indeed see that the feed is not complete. The top parts of the rss feed are missing. I am wondering WHY ??

[sicarie]

Moving to .NET forum.