This class represents a Tangent constraint node in the owning Assoc2dConstraintGroup. 

It can be applied between two constrained curve.

Autodesk.AutoCAD.DatabaseServices.ConstraintGroupNode
    Autodesk.AutoCAD.DatabaseServices.GeometricalConstraint
        Autodesk.AutoCAD.DatabaseServices.TangentConstraint

Public Class TangentConstraint
Inherits GeometricalConstraint

public class TangentConstraint : GeometricalConstraint;