Windows CE time service control

TimeService.cs

using System;
using System.Runtime.InteropServices;

namespace Arci.WindowsCE
{
    /// <summary>
    /// NTP service controller
    /// </summary>   
    public static class TimeService
    {
        // See https://msdn.microsoft.com/en-us/library/ms899593.aspx

        private const uint GENERIC_READ = 0x80000000;
        private const uint GENERIC_WRITE = 0x40000000;
        //private const uint GENERIC_EXECUTE = 0x20000000;
        private const int IOCTL_SERVICE_CONTROL = (0x104 << 16) | (7 << 2);
        private const uint OPEN_EXISTING = 3;

        [DllImport("coredll.dll", EntryPoint = "CreateFile", SetLastError = true)]
        private static extern IntPtr CreateFile(
            string lpFileName,
            uint dwDesiredAccess,
            uint dwShareMode,
            int lpSecurityAttributes,
            uint dwCreationDisposition,
            uint dwFlagsAndAttributes,
            int hTemplateFile);

        [DllImport("coredll.dll", SetLastError = true)]
        private static extern bool CloseHandle(IntPtr hObject);

        [DllImport("coredll.dll", EntryPoint = "DeviceIoControl", SetLastError = true)]
        private static extern int DeviceIoControl(
            IntPtr hDevice,
            uint dwIoControlCode,
            byte[] lpInBuffer,
            int nInBufferSize,
            byte[] lpOutBuffer,
            int nOutBufferSize,
            out int lpBytesReturned,
            IntPtr lpOverlapped);

        private static readonly IntPtr invalidHandle = new IntPtr(-1);

        /// <summary>
        /// Synchronize the system time with te external NTP server
        /// </summary>
        /// <param name="force">forces the system time to be set, regardless of any time differences between system and server</param>
        public static void SyncTime(bool force)
        {
            // https://msdn.microsoft.com/en-us/library/ms881011.aspx
            // Sync	- Synchronizes the system with the external NTP server,
            //   and sets the time according to the settings defined in the registry.
            // Set - Synchronizes the system with the external NTP server,
            //   and forces the system time to be set, regardless of any time differences between system and server.
            NtpOperation(force ? "Set\0" : "Sync\0");
        }

        private static void NtpOperation(string operation)
        {
            IntPtr hFile = CreateFile("NTP0:", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);

            if (invalidHandle == hFile)
                return;

            try
            {
                byte[] data = System.Text.Encoding.Unicode.GetBytes(operation);
                int returned;
                int result = DeviceIoControl(hFile, IOCTL_SERVICE_CONTROL, data, data.Length, null, 0, out returned, IntPtr.Zero);
            }
            finally
            {
                CloseHandle(hFile);
            }

        }

    }
}