Occurs before an application executes a request to cancel changes to the active record.
property BeforeCancel: TDataSetNotifyEvent;
__property TDataSetNotifyEvent BeforeCancel;
Write a BeforeCancel event to take specific action before an application carries out a request to cancel changes. BeforeCancel is called by the Cancel method before it cancels a dataset operation such as Edit, Insert, or Delete.
An application might use the BeforeCancel event to record a user's changes in an undo buffer.
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