C#

[DllImport("user32.dll")]
static extern int ChangeDisplaySettingsEx(string lpszDeviceName,
   ref DEVMODE lpDevMode, IntPtr hwnd, uint dwflags, IntPtr lParam);

[StructLayout(LayoutKind.Sequential)]
			public struct DEVMODE
			{
			     public const int CCHDEVICENAME = 32;
			     public const int CCHFORMNAME   = 32;
			
			     [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCHDEVICENAME)]
			     public string dmDeviceName;
			     public short  dmSpecVersion;
			     public short  dmDriverVersion;
			     public short  dmSize;
			     public short  dmDriverExtra;
			     public int    dmFields;
			
			     public short  dmOrientation;
			     public short  dmPaperSize;
			     public short  dmPaperLength;
			     public short  dmPaperWidth;
			
			     public short  dmScale;
			     public short  dmCopies;
			     public short  dmDefaultSource;
			     public short  dmPrintQuality;
			     public short  dmColor;
			     public short  dmDuplex;
			     public short  dmYResolution;
			     public short  dmTTOption;
			     public short  dmCollate;
			     [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCHFORMNAME)]
			     public string dmFormName;
			     public short  dmLogPixels;
			     public int    dmBitsPerPel;    // Declared wrong in the full framework
			     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 int    dmPositionX; // Using a PointL Struct does not work 
			     public int    dmPositionY;
			
				}
			
		public static uint CDS_RESET = 0x40000000;
        public const int CDS_UPDATEREGISTRY = 0x01;

public static void Main(string[] args)
		{
			Console.WriteLine("Hello World!");
			
			// TODO: Implement Functionality Here
						
			DEVMODE dm = new DEVMODE();
			dm.dmSize = (short)Marshal.SizeOf(dm);
			dm.dmPelsWidth = 1024;
			dm.dmPelsHeight = 768;
			dm.dmBitsPerPel = 32;
			dm.dmDisplayFrequency = 60;
			//dm.dmFields = DevModeFields.DM_BITSPERPEL | DevModeFields.DM_PELSWIDTH | DevModeFields.DM_PELSHEIGHT | DevModeFields.DM_DISPLAYFREQUENCY;
			int res = ChangeDisplaySettingsEx(@"\\.\DISPLAY2", ref dm, IntPtr.Zero, CDS_UPDATEREGISTRY, IntPtr.Zero);
			Console.WriteLine("result = " + res.ToString());
			
			Console.Write("Press any key to continue . . . ");
			Console.ReadKey(true);
		}
	}