Pure Mpi.NET

PureMpi.NET is a completely managed implementation of the message passing interface.  The object-oriented API is simple, and easy to use for parallel programming. It has been developed based on the latest .NET technologies, including Windows Communication Foundation (WCF).  This allows you to declaratively specify the binding and endpoint configuration for your environment, and performance needs.  When using the SDK, a programmer will definitely see the MPI'ness of the interfaces come through, and will enjoy taking full advantage of .NET features - including generics, delegates, asynchronous results, exception handling, and extensibility points.  

PureMpi.NET allows you to create high performance production quality parallel systems, with all the benefits of in .NET

http://www.purempi.net/