C# Definition:

/// <summary>
/// Selects duplex or double-sided printing for printers capable of duplex printing.
/// </summary>
internal enum DMDUP : short
[Flags()]
enum DM : int
{
   /// <summary>
   /// Unknown setting.
   /// </summary>
   DMDUP_UNKNOWN = 0,

   /// <summary>
   /// Normal (nonduplex) printing.
   /// </summary>
   DMDUP_SIMPLEX = 1,

   /// <summary>
   /// Long-edge binding, that is, the long edge of the page is vertical.
   /// </summary>
   DMDUP_VERTICAL = 2,

   /// <summary>
   /// Short-edge binding, that is, the long edge of the page is horizontal.
   /// </summary>
   DMDUP_HORIZONTAL = 3,
    Orientation = 0x1,
    PaperSize = 0x2,
    PaperLength = 0x4,
    PaperWidth = 0x8,
    Scale = 0x10,
    Position = 0x20,
    NUP = 0x40,
    DisplayOrientation = 0x80,
    Copies = 0x100,
    DefaultSource = 0x200,
    PrintQuality = 0x400,
    Color = 0x800,
    Duplex = 0x1000,
    YResolution = 0x2000,
    TTOption = 0x4000,
    Collate = 0x8000,
    FormName = 0x10000,
    LogPixels = 0x20000,
    BitsPerPixel = 0x40000,
    PelsWidth = 0x80000,
    PelsHeight = 0x100000,
    DisplayFlags = 0x200000,
    DisplayFrequency = 0x400000,
    ICMMethod = 0x800000,
    ICMIntent = 0x1000000,
    MeduaType = 0x2000000,
    DitherType = 0x4000000,
    PanningWidth = 0x8000000,
    PanningHeight = 0x10000000,
    DisplayFixedOutput = 0x20000000
}

Notes:

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

VB.NET Definition:

<Flags()> _
Enum DM As Integer
    Orientation = &H1
    PaperSize = &H2
    PaperLength = &H4
    PaperWidth = &H8
    Scale = &H10
    Position = &H20
    NUP = &H40
    DisplayOrientation = &H80
    Copies = &H100
    DefaultSource = &H200
    PrintQuality = &H400
    Color = &H800
    Duplex = &H1000
    YResolution = &H2000
    TTOption = &H4000
    Collate = &H8000
    FormName = &H10000
    LogPixels = &H20000
    BitsPerPixel = &H40000
    PelsWidth = &H80000
    PelsHeight = &H100000
    DisplayFlags = &H200000
    DisplayFrequency = &H400000
    ICMMethod = &H800000
    ICMIntent = &H1000000
    MeduaType = &H2000000
    DitherType = &H4000000
    PanningWidth = &H8000000
    PanningHeight = &H10000000
    DisplayFixedOutput = &H20000000
End Enum

Notes:

Used with ChangeDisplaySettings and ChangeDisplaySettingsEx

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