Sorry for forgetting about the 'blank_row'. Yeah it's dynamic...it's
set right beneath the last row within the user working area. The user
can interact with the area by adding row and delete row(only within
that area). sometimes need to find out how many rows still left....say
the user should not be able to delete a row which is the only row. In
this case, "Blank_row".Row = first_row.Row. Also can loop through from
first_row.Row to "Blank_Row".Row - 1 to process user data.

Regards
Frank