class UpdateDateTime     {        [DllImport("Kernel32.dll")]        private static extern void SetLocalTime([In, Out]   SystemTime st);         public static void UpdateTime()        {            Uri uri = new Uri("http://www.beijing-time.org/time15.asp");            WebRequest request = WebRequest.Create(uri);            WebResponse response = request.GetResponse();            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("gbk"));            string html = reader.ReadToEnd();            reader.Close();            reader.Dispose();            response.Close();            if (html[html.Length-1].Equals(';'))            {                html = html.Remove(html.Length - 1);            }                      string[] arr = html.Split(';');            SystemTime st = new SystemTime();            foreach (string str in arr)            {                switch (str.Split('=')[0].Trim().ToLower())                {                    case "nyear":                        st.Year = Convert.ToInt16(str.Split('=')[1]);                        break;                    case "nmonth":                        st.Month = Convert.ToInt16(str.Split('=')[1]);                        break;                    case "nday":                        st.Day = Convert.ToInt16(str.Split('=')[1]);                        break;                    case "nhrs":                        st.Hour = Convert.ToInt16(str.Split('=')[1]);                        break;                    case "nmin":                        st.Minute = Convert.ToInt16(str.Split('=')[1]);                        break;                    case "nsec":                        st.Second = Convert.ToInt16(str.Split('=')[1]);                        break;                }            }            SetLocalTime(st);        }    }    [StructLayout(LayoutKind.Sequential)]    class SystemTime    {        ///         ///系统时间类         ///                 public short Year;        public short Month;        public short DayOfWeek;        public short Day;        public short Hour;        public short Minute;        public short Second;        public short Milliseconds;    }