This .NET class wraps the AcGiCommonDraw ObjectARX class. 

CommonDraw abstracts out the commonality between ViewportDraw and WorldDraw. This allows graphics routines to be coded in terms of CommonDraw that will work in either case. To maintain their original signatures, WorldDraw and ViewportDraw now derive from CommonDraw. 

Autodesk.AutoCAD.GraphicsInterface.CommonDraw
    Autodesk.AutoCAD.GraphicsInterface.ViewportDraw

Public abstract Class CommonDraw
Inherits RXObject

public abstract class CommonDraw : RXObject;