Asynchronous File Download with Progress Bar?

You should calling startDownload() from the UI thread. The whole idea of WebClient. DownloadFileAsync() is that it will spawn a worker thread for you automatically without blocking the calling thread.

In startDownload(), you specified callbacks that modify controls which I assume were created by the UI thread. Thus if you call startDownload() from a background thread it will cause problems, because a thread can only modify UI elements it created.

UI Thread will be freezed when you click startDownload(). If you don't want get form freezed, you use startDownload() in another thread and make progress updating in cross-threaded.

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