This .NET enum wraps the AcDb::IndexCreation ObjectARX enumeration. 

This enum supports the INDEXCTL header variable. Fields are bit-coded and can be OR'd together using a bitwise OR.

Public Enum IndexCreation
  NoIndex
  IndexByLayer
  IndexSpatially
End Enum

public enum IndexCreation {
  NoIndex,
  IndexByLayer,
  IndexSpatially
}