Thanks.
Why? (as in "why are you making a copy of data you already have and storing
it?") Unless there's a business need, you could just "calculate" the
concatenated string when you need it (e.g., for a form or a report).
Typically, this would be done in a query, creating a new (query) field
something like:
FullName: [FirstName] & " " & [LastName]
Good luck!
Jeff Boyce
<Access MVP>