Why BackgroundWorker started itself?

In my application backgroundWorker starts when I start the application. I can't see anything befo开发者_StackOverflow社区re backgroundworker_dowork in call stack other than [external code].

Why backgroundworker is starting itself and how to avoid that?

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BackgroundWorkers are started by calling the worker's RunWorkerAsync method. Find where this method is being called, breakpoint it and see what's what.