wkx-sharp 
A WKT/WKB/EWKT/EWKB parser and serializer with support for
- Point
- LineString
- Polygon
- MultiPoint
- MultiLineString
- MultiPolygon
- GeometryCollection
- CircularString
- CompoundCurve
- CurvePolygon
- MultiCurve
- MultiSurface
- PolyhedralSurface
- TIN
- Triangle