This class represents a G2Smooth composite constraint node in the owning Assoc2dConstraintGroup. 

It can be applied between a constrained bounded spline and other constrained bounded curve. It is a combination of AcTangentConstraint and AcEqualCurvatureConstraint.

Autodesk.AutoCAD.DatabaseServices.ConstraintGroupNode
    Autodesk.AutoCAD.DatabaseServices.GeometricalConstraint
        Autodesk.AutoCAD.DatabaseServices.CompositeConstraint
            Autodesk.AutoCAD.DatabaseServices.G2SmoothConstraint

Public Class G2SmoothConstraint
Inherits CompositeConstraint

public class G2SmoothConstraint : CompositeConstraint;