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Silverlight multiple callbacks within the same host not working
HttpWebRequest HttpWebRequest = (HttpWebRequest)WebRequest.Create(UploadUrl);
HttpWebRequest.Method = "POST";
HttpWebRequest.BeginGetRequestStream(new AsyncCallback(WriteFile), HttpWebRequest);

HttpWebRequest.BeginGetResponse(new AsyncCallback(ReadCallback), HttpWebRequest);

WebClient WebClient = new WebClient();
WebClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler((object sender2, DownloadStringCompletedEventArgs e2) =>
{
    //Tell the client the file is done
});
WebClient.DownloadStringAsync(new Uri(processUrl));