Labels:text | screenshot | font | number OCR: TDataSource Event When Triggered OnDataChange When the view of the current record needs to be refreshed, usually as a result of moving to another record or the table being refreshed OnUpdateData When a field(s) value in the current record is about to be updated prior to posting the record OnStateChange When the mode or state of a dataset changes Figure 2 (Middle): The TDataSource events.