error opening sql 2005 database in VS 2008

When I created my database using sql server 2005, i was able to connect and view it in Visual Studio 2008. I then detached the database onto my flash drive. Brought it home to work in VS 2008 - that worked. finally when i detached it from home and brought back to work, it will not open. It is saying that this version of sql server is not compatible with another version. I forget the exact wordin开发者_StackOverflowg of the error, as it was lengthy.

any help you guys and provide would be very helpful!

Thank you in advance!

I'll take a guess:

At home you have SQL 2008 (Express).

The upgrade of the database from the 2005 format to 2008 is automatic and silent but SQL2008 databases are not backward compatible.