This .NET class wraps the DataType ObjectARX class.

Public Enum DataType
  Buffer = &H80
  Date = 8
  Double = 2
  General = &H200
  Long = 1
  ObjectId = &H40
  Point = &H10
  Point3d = &H20
  Resbuf = &H100
  String = 4
  Unknown = 0
End Enum

public enum DataType {
  Buffer = 0x80,
  Date = 8,
  Double = 2,
  General = 0x200,
  Long = 1,
  ObjectId = 0x40,
  Point = 0x10,
  Point3d = 0x20,
  Resbuf = 0x100,
  String = 4,
  Unknown = 0
}