This .NET class wraps the AcDbRasterVariables ObjectARX class. 

The RasterVariables object carries all drawing-scope persistent variables associated with AutoCAD raster image management and display. A single object of this type is stored in each drawing file that contains image entities.

Autodesk.AutoCAD.DatabaseServices.DBObject
    Autodesk.AutoCAD.DatabaseServices.RasterVariables

Public Class RasterVariables
Inherits DBObject

public class RasterVariables : DBObject;

DBObject, RasterImage, RasterImageDef