I am struggling with getting a simplemembership scenario working in my EntityFramework / MVC4 / DatabaseFirst project. I\'ve found plenty of examples for working with code
For simplicity and clarity keep two connection strings pointing to the same database. One for EF (doesn't matter if code first or data first) and one for your WebSecurity stuff. (As Chad and Erik said)
Note that the providers are different: EF uses System.data.EntityClient and non-EF one uses System.Data.SqlClient.