RE: backgroundworker thread

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Hi Chuck,

Sorry for the late response, I am out of office yesterday.

Oh, yes, if your requirement is how to prevent the application from closing
before the background task is done, you may stop the main form from closing
in FormClosing event. The thread you found use a ManualResetEvent to do the
interthread synchronization.

Another choice is setting FormClosingEventArgs.Cancel to true in
Form1_FormClosing event(which cancels the form closing), then you may pop
up a dialog to the end user to notify them the background task is still in
process. This choice may be better than the ManualResetEvent one because
ManualResetEvent.WaitOne() calling in FormClosing event will hang the UI
thread of your winform application, which makes the use confused. If the
background task will cost long time, the hang may make the users think
there is something wrong in the application, so they may use task manager
to kill the winform application.

Anyway, if you have anything unclear, please feel free to tell me, thanks.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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