This .NET class wraps the AcDbSectionSettings::Generation ObjectARX enum. 

Generation flags to control section creation. There are two groups of flags: source of section to generate and destination. One value from each group should be OR'd to set the generation options. SourceAllObjects and SourceSelectedObjects form the second group to specify the source. DestinationNewBlock, DestinationReplaceBlock, and DestinationFile form the third group to specify destination for the generated geometry.

Public Enum SectionGeneration
  DestinationFile = &H40
  DestinationNewBlock = &H10
  DestinationReplaceBlock = &H20
  SourceAllObjects = 1
  SourceSelectedObjects = 2
End Enum

public enum SectionGeneration {
  DestinationFile = 0x40,
  DestinationNewBlock = 0x10,
  DestinationReplaceBlock = 0x20,
  SourceAllObjects = 1,
  SourceSelectedObjects = 2
}