Column values are modified by calling the appropriate setType or AppendType method(s). The first append on a column clears
the current column value prior to appending the new value.
The data in the row is not actually changed until you call the Update method, and changes are not made permanent until committed.
Modifying columns in the index used to open the table affects active searches in unpredictable ways. Columns in the primary
key of the table can not be updated.
Visual Basic syntax