How to split a Surface using a Curve in Rhino.Inside?

Dear Forum Users,

I have a curve lying on a surface and want this curve to split the surface into two subsurfaces.

I have found a Rhino.Geometry.Surface.RefitSplit ( ) method in the help documentation. However, I cannot see the RefitSplit ( ) method either in the instance of the Surface or directly under Surface class.

I develop a standalone C# console project and utilizing Rhino.Inside.

Do you have any suggestions how I could get this method or any ideas to split a surface defined by a curve intersection edge ?

Best Regards,

Ahmet