This .NET enum wraps the AcGsModel::InvalidationHint ObjectARX enum. It tells the Graphic System how to process the invalidate method.

Public Enum InvalidationHint
  InvalidateNone
  InvalidateIsolines
  InvalidateViewportCache
  InvalidateAll
  InvalidateAllStatic
  InvalidateFacets
  InvalidateFills
  InvalidateLinetypes
  InvalidateMaterials
End Enum

public enum InvalidationHint {
  InvalidateNone,
  InvalidateIsolines,
  InvalidateViewportCache,
  InvalidateAll,
  InvalidateAllStatic,
  InvalidateFacets,
  InvalidateFills,
  InvalidateLinetypes,
  InvalidateMaterials
}