How to generate geodesic linestring from two points in C#

I'm looking for a FREE C# class, library or set of functions that will allow me to generate a geodesic linestring (or array of vertices, whatever) from two decimal degree points.

I've found javascript functions that do what I want, but no luck with C# ones.

I suppose I could translate it from the above javascript. But I'd prefer to use something tried and tested.

Anyone know of such functions, classes or libraries?