SlimDX

SlimDX is an open source library originally prototyped by Promit Roy which allows .NET 2.0+ applications (including C#, VB.NET, IronPython, F#, and more) to use Microsoft's DirectX APIs, as well as several related Microsoft multimedia APIs. This role was previously filled for .NET 1.1 applications by Microsoft's own Managed DirectX (MDX) library. However, the age of .NET 1.1, and Microsoft's lack of interest in continuing MDX, have made it necessary to build a new library. Thanks to enthusiastic community support and the invaluable contributions of several other developers who have worked on and with SlimDX, the library has become a fully viable platform on which to build DirectX based applications.

Binary Download 

http://slimdx.org/download.php

Project  Source

http://code.google.com/p/slimdx/source/checkout