This .NET class wraps the AcDbPlotSettings::ShadePlotType ObjectARX enum. 

This enumerated type defines the shade plot mode of the current PlotSettings object. This mode specifies how viewports will plot.

Public Enum PlotSettingsShadePlotType
  AsDisplayed
  Wireframe
  Hidden
  Rendered
  VisualStyle
  RenderPreset
End Enum

public enum PlotSettingsShadePlotType {
  AsDisplayed,
  Wireframe,
  Hidden,
  Rendered,
  VisualStyle,
  RenderPreset
}