Unhandled exceptions in BackgroundWorker

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If the operation raises an exception that your code does not handle, the BackgroundWorker catches the exception and passes it into the RunWorkerCompleted event handler, where it is exposed as the Error property of System.ComponentModel.RunWorkerCompletedEventArgs. If you are running under the Visual Studio debugger, the debugger will break at the point in the DoWork event handler where the unhandled exception was raised.

http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.dowork.aspx

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