Contained Database Authentication: How to control which databases are allowed to authenticate users using logon triggers

With the release of Microsoft SQL Server code-name “Denali” Community Technology Preview 1 (CTP1) and the introduction of Contained Database (CDB) (http://msdn.microsoft.com/en-us/library/ff929071(SQL.110).aspx ), we also introduced the capability of  database authentication (http://msdn.microsoft.com/en-us/library/ms173463(v=SQL.110).aspx , http://blogs.msdn.com/b/sqlsecurity/archive/2010/12/03/