Silverlight ASP.NET control: AsyncFileUpload

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OpenFileDialog ofd = new OpenFileDialog();
ofd.Title = "Select a file...";
ofd.Filter = "Word Documents|*.doc;*.txt|All Files|*.*";
ofd.EnableMultipleSelection = true;
if (ofd.ShowDialog() == DialogResult.OK) {
    foreach (FileDialogFileInfo file in ofd.SelectedFiles) {
        using (StreamReader reader = file.OpenRead()) {
            string fileName = file.Name;
            string contents = reader.ReadToEnd();
            // ...
        }
    }
}

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// NOTE: In the future we'd like to hide BrowserHttpRequest, so you only need to 
// use (and know about) HttpWebRequest. That should make it easier to port code 
// between different environments (Silverlight/desktop).
HttpWebRequest request = new BrowserHttpRequest();
request.Method = "POST";
StreamWriter writer = new StreamWriter(request.GetRequestStream());
writer.Write(...);

request.BeginGetResponse(OnResponse, request);

...

void OnResponse(IAsyncResult asyncResult) {
    HttpWebRequest request = (HttpWebRequest)asyncResult.AsyncState;
    HttpWebResponse response = request.EndGetResponse(asyncResult);
    using (StreamReader reader = new StreamReader(response.GetResponseStream())) {
        // response.StatusCode, ...
        string responseText = reader.ReadToEnd();
    }
}

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[Scriptable]
public class AsyncFileUpload : Canvas {

    void OnCanvasLoaded(object sender, EventArgs e) {
        // We need to explicitly expose object instances to JavaScript.
        WebApplication.Current.RegisterScriptableObject("uploader", this);
    }

    [Scriptable]
    public event EventHandler<ProgressChangedEventArgs> ProgressChanged;

    ....
}

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var control = document.getElementById('AgControl1');
var uploader = control.Content.uploader;
uploader.ProgressChanged = function(sender, args) {
    // Sender is currently always null.
    // Use args.Progress here...
}

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// TODO: Use the following line of code instead once a bug in Silverlight's assembly url parser is fixed.
                _host.AssemblyPath = Page.ClientScript.GetWebResourceUrl(typeof(ClientServices), "Wilco.Web.Silverlight.Resources.Wilco.Windows.Browser.dll");