C#, Updating a Progress Bar Using Background Worker From a Different Class?

You cant alter the UI unless you are on the main thread, which you BackgroundWorker will not be.

I think the reason is that you get an IllegalCrossThreadException, because you're attempting to access the control from a different thread than it was created. The BackgroundWorker provides a ReportProgress method and a ProgressChanged event that is typically used for such updating and which will be executed on the UI thread. When accessing the progressbar from another thread than the UI thread, do it like this.

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