Gets a value indicating whether the application has requested cancellation of a background operation.
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If BackgroundWorker.CancellationPending is true, then the BackgroundWorker.CancelAsync method has been called on the System.ComponentModel.BackgroundWorker.
This property is meant for use by the worker thread, which should periodically check BackgroundWorker.CancellationPending and abort the background operation when it is set to true.