C# threading issue?

First, there is no need to create new threads inside DoWork the whole idea with the BackgroundWorker is that DoWork is executed on a separate thread. Second, since DoWork is executed on a separate thread and UI controls can be modified only on the UI thread, you need to invoke those updates correctly. So, a rewritten version of worker_DoWork could look like this.

The main reason is that the textbox is not owned by the background thread.

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