Detach sql files on closing?

a)I have App that connect directly to SQL files (*.mdf). I realize that
this connection Attach the files to SQL server. How I can force Detach
mdf on closing program?

b)also I try add to project SQL DataBase but I got error that I not
have SQL Express. but I have Developer SQL 2005!?

IIRC this was already answered. Set autoclose on the database (SQL Server
Management Studio Database Properties). SQL Express is a separate SKU--it
must be installed separately.

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