>My company has a legacy system running pure VFP8.
>One of our client wants to move to sql server as a back end.
>We thought about rewriting the app using c#.
>But have decided to use the same VFP code and simply adding SQL server capability...... with same table structures.
>
>So, the app can run in full VFP mode. or full SQL SERVER mode.
>
>Can anyone make an argument AGAINST doing such thing?
>
>Thanks in advance..

No :-)
Just use CAs and all will be fine :-)
As Tore said use business class and you can switch between DBs easy.