RAD Studio VCL Reference
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Indicates whether an index into the columns array refers to a valid field in the dataset.
function ValidFieldIndex(FieldIndex: Integer): Boolean;
__fastcall Boolean ValidFieldIndex(int FieldIndex);
Call ValidFieldIndex to determine whether a column displays data from a field in the dataset. ValidFieldIndex returns true if the column is associated with a database field. ValidFieldIndex returns false if the column is a calculated field or if the field for the column is undefined.
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