cannot be opened because it is version 706. This server supports version 662 and earlier. A downgrade path is not supported

Question

When i am trying to run my website (with aspx) this problem comes up:

An exception of type \'System.Data.SqlClient.SqlException\' occurred in System

Answer 1

If you’re trying to attach to a local db use LocalDb (since vs2012, sql2012), ie:

Data Source=(LocalDB)\v11.0;AttachDbFilename= (etc)

Answer 2

Looks like the Database.mdf file was created with a later version of SQL Server Express (2012) than the one installed on the server (2008). Upgrade the server with the latest version of SQL Server Express.