Move displays programmatically on Windows in C#

MoveDisplays.cs

// quick bit of code to move displays to specific locations in C#

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct DEVMODE
{
	[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
	public string dmDeviceName;

	public short dmSpecVersion;
	public short dmDriverVersion;
	public short dmSize;
	public short dmDriverExtra;
	public int dmFields;
	public int dmPositionX;
	public int dmPositionY;
	public int dmDisplayOrientation;
	public int dmDisplayFixedOutput;
	public short dmColor;
	public short dmDuplex;
	public short dmYResolution;
	public short dmTTOption;
	public short dmCollate;

	[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
	public string dmFormName;

	public short dmLogPixels;
	public short dmBitsPerPel;
	public int dmPelsWidth;
	public int dmPelsHeight;
	public int dmDisplayFlags;
	public int dmDisplayFrequency;
	public int dmICMMethod;
	public int dmICMIntent;
	public int dmMediaType;
	public int dmDitherType;
	public int dmReserved1;
	public int dmReserved2;
	public int dmPanningWidth;
	public int dmPanningHeight;
	
	public static DEVMODE Create()
	{
		DEVMODE dm = new DEVMODE();
		dm.dmDeviceName = new String(new char[32]);
		dm.dmFormName = new String(new char[32]);
		dm.dmSize = (short)Marshal.SizeOf(dm);
		return dm;
	}
};

// PInvoke declaration for EnumDisplaySettings Win32 API
[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern int EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);

[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern int ChangeDisplaySettingsEx(string lpszDeviceName, ref DEVMODE lpDevMode, IntPtr hWnd, int dwFlags, IntPtr lParam);


// constants
public const int ENUM_CURRENT_SETTINGS = -1;
public const int CDS_UPDATEREGISTRY = 0x01;
public const int CDS_TEST = 0x02;
public const int DISP_CHANGE_SUCCESSFUL = 0;
public const int DISP_CHANGE_RESTART = 1;
public const int DISP_CHANGE_FAILED = -1;

const int DM_BITSPERPEL = 0x40000;
const int DM_DISPLAYFLAGS = 0x200000;
const int DM_DISPLAYFREQUENCY = 0x400000;
const int DM_PELSHEIGHT = 0x100000;
const int DM_PELSWIDTH = 0x80000;
const int DM_POSITION = 0x20;

void Main()
{
	// get existing position info
	DEVMODE dm = DEVMODE.Create();
	EnumDisplaySettings(@"\\.\DISPLAY5", ENUM_CURRENT_SETTINGS, ref dm);
	
	// change x/y position here
	dm.dmPositionX = -1920;
	// tell ChangeDisplaySettingsEx to ignore all fields but the position
	dm.dmFields = DM_POSITION;
	
	// change the position
	ChangeDisplaySettingsEx(@"\\.\DISPLAY5", ref dm, IntPtr.Zero, 0, IntPtr.Zero);
}