C# Definition:

  /// <summary>
  /// Switches between color and monochrome on color printers.
  /// </summary>
  internal enum DMCOLOR : short
  {
    DMCOLOR_UNKNOWN = 0,

    DMCOLOR_MONOCHROME = 1,

    DMCOLOR_COLOR = 2
  }

Notes:

The definition of DMCOLOR_UNKNOWN is only to satisfy the rule, that every enum should have a zero value.