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

It can be applied between two same type of constrained geometries (except spline).

Autodesk.AutoCAD.DatabaseServices.ConstraintGroupNode
    Autodesk.AutoCAD.DatabaseServices.GeometricalConstraint
        Autodesk.AutoCAD.DatabaseServices.SymmetricConstraint

Public Class SymmetricConstraint
Inherits GeometricalConstraint

public class SymmetricConstraint : GeometricalConstraint;