DirectField
Returns or sets the field of direct link (object Field). The field must belong to an external database table or cataloged query upon which the descriptor of the link has been built. The field must be of type integer and have a precision not less than 10 decimal digits (you can determine a field precision by the Field::Precision property). The field of direct link stores an internal number of a feature of specified type. The value of this field connects features with records of table or query. Setting a value of this property is possible only if the link mode is the direct link (the property DataLink::LinkCategory returns gdbLinkDirect). If there are other link modes, the property value is Null. If you change the link mode, the property becomes Null. The property supports read/write access.
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