I've been using Visual Studio 2005 Professional with .mdb files. 

Now I just installed Access 2007 which have .accdb files. 

Visual Studio will not let me use this as a datasource. When adding, for 
example, a Access DataSource for a Gridview, I get this error message.

"Database schema could not be retrieved for this connection...Unrecognized 
database format."

On Jun 5, 3:32 pm, Joel in Redmond
 wrote:

> I've been using Visual Studio 2005 Professional with .mdb files.
>
> Now I just installed Access 2007 which have .accdb files.
>
> Visual Studio will not let me use this as a datasource. When adding, for
> example, a Access DataSource for a Gridview, I get this error message.
>
> "Database schema could not be retrieved for this connection...Unrecognized
> database format."


You need to use the ACE.OLEDB provider. The old Jet4 driver won't
work.

Look at http://www.connectionstrings.com/