由实体框架自动创建的数据库的位置

I have been using Entity framework recently and my WPF application totally works fine although i have a little problem. Despite it stores and retrieves data, i can not see or find the data base which has been created by the framework. When i start SqlServer management studio there is no new data base there. I also searched this path "C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA" but i couldn't find it. Another odd thing is that i didn't put any connection string inside the config file but as i said, it stores data somewhere in an anonymous data base. Would you mind telling me where exactly the data base is ? I am using Microsoft Sql Server 2008R2.I have been using Entity framework recently and