The predefined queries are just:
Select * from authors
Select * from publisher

I am not sure how to customize using datagrid.tablestyles, since the number of columns of tables (authors and publishers) are different, and user defined query could be different too. Somehow in the dataset schema, it has those linking columns from other tables, when I deleted them, the data returned did not show the linking columns. I am not sure if that was the problem.

Combo box question:
A user is supposed to be able to add/run his own query, eg. select * from authors where lastname ="smith". The user is querying an Access database. or is this not supposed to happen with a combo box? I want the combo box has a list of predefined query as well as used added query.

Thank you for your reply!