Make it an habit to modify the database structure with a script. You can easily send and run that script on the client site afterward. Never modify the database structure directly, unless you are developing the very first version of the database.

>I currently use Stonefield Database Toolkit. With it when there is a change in my database structure it's really easy to put those changes on a client's computer.
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>Now I want to change from DBF to SQL Server. Is there a utility that would let me do the same things that SDT lets me do when there will be a change in the database structure on my side and reflect it on the client's computer?