RAD Studio VCL Reference
TDataSet.BookmarkSize Property

Indicates the number of bytes used to represent a bookmark.

property BookmarkSize: Integer;
__property int BookmarkSize;

Bookmarks mark a location in a dataset so that an application can easily return to that location quickly. Descendants of TDataSet can use different mechanisms for storing enough information to identify records when applications set bookmarks. BookmarkSize indicates the number of bytes required to specify bookmark information for a particular dataset.

Note: Unidirectional datasets do not support bookmarks.

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