[YouTube-API] 'resumable' uploads can not be resumed with C# (.Net)

I am facing a critical problem. I tried to use the ResumableUploader
to upload videos to youtube in a chunked way and to resume if the
connection was lost.
Uploading works pretty fine but I can not resume any upload. Each time
I try to resume an upload (no matter if aborted by cancel_async or by
cutting the connection and waiting for timeout) I get an error stating
that it is not possible to write into the connection, because it had
already been opened. What may I do to get it working. By the way: I
believe I have read about this problem in .Net before...

Here is a snipped of my code:
[code]
// start the upload
ResumableUploader m_ResumableUploader = null;
Authenticator YouTubeAuthenticator;

m_ResumableUploader = new ResumableUploader(256); //chunksize 256
kilobyte
m_ResumableUploader.AsyncOperationCompleted += new
AsyncOperationCompletedEventHandler(Service_AsyncOperationCompleted);
m_ResumableUploader.AsyncOperationProgress += new
AsyncOperationProgressEventHandler(Service_AsyncOperationProgress);

YouTubeAuthenticator = new ClientLoginAuthenticator("YouTube
Uploader", ServiceNames.YouTube, YTusername, YTpassword);
YouTubeAuthenticator.DeveloperKey = "my devkey here";

newVideo.MediaSource = new MediaFileSource(videoDateinamen[k],
MediaFileSource.GetContentTypeForFileName(videoDateinamen[k]));

AtomLink link = new AtomLink("http://uploads.gdata.youtube.com/
resumable/feeds/api/users/default/uploads");
link.Rel = ResumableUploader.CreateMediaRelation;
newVideo.YouTubeEntry.Links.Add(link);
UploadError = "";
m_ResumableUploader.InsertAsync(YouTubeAuthenticator,
newVideo.YouTubeEntry, "inserter");

[...]

// if no progress for some time -> abort and resume
if (uploadPosition == lastUploadPosition && lastChunk.AddSeconds(20) <
DateTime.Now)
{
// Seit 20 Sekunden kein Fortschritt
DateTime waitStart = DateTime.Now;
m_ResumableUploader.CancelAsync(key);
while (DateTime.Now < waitStart.AddSeconds(310)) // wait for the
current connection to time out
{
statusLabel.Text = "Unterbrochen... " + (310-(DateTime.Now -
waitStart).Seconds).ToString();
this.Refresh();
Application.DoEvents();
System.Threading.Thread.Sleep(1);
}
Stream s = newVideo.MediaSource.GetDataStream();
s.Seek(uploadPosition, SeekOrigin.Begin); // set position
m_ResumableUploader = new ResumableUploader(256); //chunksize 256
kB
m_ResumableUploader.AsyncOperationCompleted += new
AsyncOperationCompletedEventHandler(Service_AsyncOperationCompleted);
m_ResumableUploader.AsyncOperationProgress += new
AsyncOperationProgressEventHandler(Service_AsyncOperationProgress);
m_ResumableUploader.ResumeAsync(YouTubeAuthenticator, uploadUri,
httpVerb, s,
MediaFileSource.GetContentTypeForFileName(videoDateinamen[k]),
key); // resume the upload
MessageBox.Show("Resume:\r\nPosition: " + uploadPosition + "\r\n"
+ uploadUri + "\r\n" + httpVerb + "\r\n" +
MediaFileSource.GetContentTypeForFileName(videoDateinamen[k]));
lastChunk = DateTime.Now;
lastUploadPosition = uploadPosition;
}
[/code]

Any suggestions about that? I am really confused and need to get this
working!

Thanks in advance!
garv3

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