This class represents a constrained unbounded line node in the owning Assoc2dConstraintGroup.

Autodesk.AutoCAD.DatabaseServices.ConstraintGroupNode
    Autodesk.AutoCAD.DatabaseServices.ConstrainedGeometry
        Autodesk.AutoCAD.DatabaseServices.ConstrainedCurve
            Autodesk.AutoCAD.DatabaseServices.ConstrainedLine
                Autodesk.AutoCAD.DatabaseServices.ConstrainedBoundedLine
                Autodesk.AutoCAD.DatabaseServices.ConstrainedConstructionLine

Public Class ConstrainedLine
Inherits ConstrainedCurve

public class ConstrainedLine : ConstrainedCurve;