private static XmlDocument sendYoutubeRequest(string requestXml)
{
    string destinationUrl = "http://gdata.youtube.com/feeds/api/videos/batch";

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(destinationUrl);
    byte[] bytes;
    bytes = System.Text.Encoding.ASCII.GetBytes(requestXml);
    request.ContentType = "text/xml; encoding='utf-8'";
    request.ContentLength = bytes.Length;
    request.Method = "POST";
    request.Headers.Add("X-GData-Key", "key=(my key)");
    Stream requestStream = request.GetRequestStream();
    requestStream.Write(bytes, 0, bytes.Length);
    requestStream.Close();
    HttpWebResponse response;
    try { response = (HttpWebResponse)request.GetResponse(); }
    catch { return null; }
    if (response.StatusCode == HttpStatusCode.OK)
    {
        Stream responseStream = response.GetResponseStream();
        XmlReader reader = new XmlTextReader(responseStream);

        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(reader);

        //Close XMLReader
        try { reader.Close(); }
        catch { }
        try { responseStream.Close(); }
        catch { }
        try { response.Close(); }
        catch { }
        return xmlDoc;
    }
    try { response.Close(); }
    catch { }
    return null;
}