This .NET class wraps the AcCmEntityColor::ColorMethod ObjectARX enum. 

The enum specifies how the color is stored.

Public Enum ColorMethod
  ByAci = &Hc3
  ByBlock = &Hc1
  ByColor = &Hc2
  ByLayer = &Hc0
  ByPen = &Hc4
  Foreground = &Hc5
  LayerFrozen = &Hc7
  LayerOff = &Hc6
  None = 200
End Enum

public enum ColorMethod {
  ByAci = 0xc3,
  ByBlock = 0xc1,
  ByColor = 0xc2,
  ByLayer = 0xc0,
  ByPen = 0xc4,
  Foreground = 0xc5,
  LayerFrozen = 0xc7,
  LayerOff = 0xc6,
  None = 200
}