This .NET class wraps the AcGsModel ObjectARX class. 

The Model class is an abstraction of a database. This database may be an Database, it may be a container for transient graphics (such as the Icon and Grid), or it may represent another persistent database format such as DWF. Most significantly, the Model provides a mechanism for the database to inform the graphics system (GS) of changes (additions, deletions, and modifications). 

Each Model has a RenderType that provides a hint to the GS about how this model's geometry should be rendered.

Autodesk.AutoCAD.GraphicsSystem.Model

Public Class Model
Inherits DisposableWrapper

public class Model : DisposableWrapper;

Drawable, Device, View, Configuration, Manager