The Connection Properties dialog opens. For my sample ITworld application, I changed the data source to Microsoft SQL Server (SQLClient), and entered the necessary Server, Log On, and database values.

Use custom-built .NET Framework 4.0 classes to connect an ASP.NET Web application to a SQL Server 2012 database.

If you just want to get going with a code-first database, you don't even need to define a connection string -- just write your objects.