RAD Studio VCL Reference
TDataSet.BeforeOpen Event

Occurs before an application executes a request to open a dataset.

property BeforeOpen: TDataSetNotifyEvent;
__property TDataSetNotifyEvent BeforeOpen;

Write a BeforeOpen event handler to take specific action before an application opens a dataset for viewing or editing. BeforeOpen is triggered when an application sets the Active property to true for a dataset or an application calls Open


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