Default constructor. Creates an empty instance.

Public Sub New()
Public Sub New(
    curveDef As IntPtr, 
    curveKind As Autodesk.AutoCAD.Geometry.ExternalEntityKind
)

public ExternalCurve2d();
public ExternalCurve2d(
    IntPtr curveDef, 
    Autodesk.AutoCAD.Geometry.ExternalEntityKind curveKind
);