Database created in SQL Server Management Studios cannot be found by Visual Studio 2010

Question

I created a new database (AC_2012) on my localhost in SQL Server 2008 Management Studio.

I\'m trying to connect it via connection string in web.con

Answer 1

Database names with an underscore _ need to be delimited with square braces [].

Try

connectionString="server=.\SQLEXPRESS;database=[AC_2012]; integrated security=True; "

Alternatively, just don't put an underscore in your database name.