New Embedded Database Support with ASP.NET - ScottGu's Blog

SQL CE 4.0 (Beta)

SQL CE works with existing .NET-based data APIs, and supports a SQL Server compatible query syntax. This means you can use existing data APIs like ADO.NET, as well as use higher-level ORMs like Entity Framework and NHibernate with SQL CE.

SQL CE does not require you to run a setup or install a database server in order to use it. You can now simply copy the SQL CE binaries into the \bin directory of your ASP.NET application, and then your web application can run and use it as a database engine.


http://blogs.msdn.com/b/sqlservercompact/