c# 编程修改 wince 系统时间

        [StructLayout(LayoutKind.Sequential)]
        public struct SYSTEMTIME
        {
            public ushort wYear;
            public ushort wMonth;
            public ushort wDayOfWeek;
            public ushort wDay;
            public ushort wHour;
            public ushort wMinute;
            public ushort wSecond;
            public ushort wMilliseconds;
        }
        [DllImport("coredll.dll")]
        private static extern bool SetLocalTime(ref SYSTEMTIME lpSystemTime);
        [DllImport("coredll.dll")]
        private static extern bool GetLocalTime(ref SYSTEMTIME lpSystemTime);     

            SYSTEMTIME lpTime =  new SYSTEMTIME (); 
            lpTime.wYear =  Convert.ToUInt16(N.Text); 
            lpTime.wMonth = Convert.ToUInt16(Y.Text); 
            lpTime.wDay = Convert.ToUInt16(R.Text); 
            lpTime.wHour = Convert.ToUInt16(S.Text); 
            lpTime.wMinute = Convert.ToUInt16(F.Text); 
            lpTime.wSecond = Convert.ToUInt16(M.Text);
            SetLocalTime(ref lpTime);