Raises the Form.Closing event.
This method is not relevant for this class.
The PrintPreviewDialog.OnClosing(System.ComponentModel.CancelEventArgs) method invalidates the preview so it is regenerated when the dialog is reopened.
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The PrintPreviewDialog.OnClosing(System.ComponentModel.CancelEventArgs) method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.