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TDataSet.Bof
TDataSet
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Indicates whether or not a cursor is positioned at the first record in a dataset.

property Bof: Boolean;

Description
Test Bof (beginning of file) to determine if the cursor is positioned at the first record in a dataset. If Bof is True, the cursor is unequivocally on the first row in the dataset. Bof is True when an application

·Opens a dataset.  
·Calls a dataset's First method.  
·Call a dataset's Prior method, and the method fails (because the cursor is already on the first row in the dataset).  
·Calls SetRange on an empty range or dataset.  

Bof is False in all other cases.
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