OBDLib is an OBD2 (On-board diagnostics http://en.wikipedia.org/wiki/On-board_diagnostics) library in C# (.NET 4.0). It is in early stage of development, only a few OBD2 PIDs are implemented for the moment.
Developed with MonoDevelop 2.8.6.3 under Linux Mint and compatible with Visual Studio 2010/2012 and Xamarin Studio v4.x under Windows 7