Sorry not aware of anything that will let you do this. If you are familiar with calling C/C++ from C# you may be able to build it yourself using the Lego fantom driver toolkit, take a look at our native driver for some idea of what you will need to do...http://lejos.svn.sourceforge.net/viewvc ... k/jfantom/
If this is only a small project you will almost certainly be better off using Java on the PC. Things will be easier and you can get help with any problems. Is there any particular reason why you want to use C#?