SQLite

http://sqlite.phxsoftware.com/

An open-source, enhanced version of the SQLite database engine for Windows

http://sourceforge.net/projects/sqlite-dotnet2/
ADO.NET 2.0 Provider for SQLite. Supports Full and Compact Framework, complete with full Visual Studio 2005 design-time support.

http://www.infoq.com/cn/news/2008/01/sqlite-in-three-minutes
SQLite——只要3分钟，你就可以在.NET上创建和运行它