#region
        /// <summary>           
        /// 获取标准北京时间        
        /// /// </summary>          
        /// /// <returns></returns>        
        ///   
        public static DateTime GetStandardTime()
        {
            /// //<?xml version="1.0" encoding="GB2312" ?>                
            //- <ntsc>               
            //- <time>              
            //  <year>2011</year>           
            //  <month>7</month>           
            //  <day>10</day>             
            //  <Weekday />      
            //  <hour>19</hour>           
            //  <minite>45</minite>           
            //  <second>37</second>            
            //  <Millisecond />           
            //  </time>            
            //  </ntsc>            
            DateTime dt;
            WebRequest wrt = null;
            WebResponse wrp = null;
            try
            {
                wrt = WebRequest.Create("http://www.time.ac.cn/timeflash.asp?user=flash");
                wrt.Credentials = CredentialCache.DefaultCredentials;
                wrp = wrt.GetResponse();
                StreamReader sr = new StreamReader(wrp.GetResponseStream(), Encoding.UTF8);
                string html = sr.ReadToEnd();
                sr.Close();
                wrp.Close();
                int yearIndex = html.IndexOf("<year>") + 6;
                int monthIndex = html.IndexOf("<month>") + 7;
                int dayIndex = html.IndexOf("<day>") + 5;
                int hourIndex = html.IndexOf("<hour>") + 6;
                int miniteIndex = html.IndexOf("<minite>") + 8;
                int secondIndex = html.IndexOf("<second>") + 8;
                string year = html.Substring(yearIndex, html.IndexOf("</year>") - yearIndex);
                string month = html.Substring(monthIndex, html.IndexOf("</month>") - monthIndex); ;
                string day = html.Substring(dayIndex, html.IndexOf("</day>") - dayIndex);
                string hour = html.Substring(hourIndex, html.IndexOf("</hour>") - hourIndex);
                string minite = html.Substring(miniteIndex, html.IndexOf("</minite>") - miniteIndex);
                string second = html.Substring(secondIndex, html.IndexOf("</second>") - secondIndex);
                dt = DateTime.Parse(year + "-" + month + "-" + day + " " + hour + ":" + minite + ":" + second);
            }
            catch (WebException)
            {
                return DateTime.Parse("2011-1-1");
            }
            catch (Exception)
            {
                return DateTime.Parse("2011-1-1");
            }
            finally
            {
                if (wrp != null)
                    wrp.Close();
                if (wrt != null)
                    wrt.Abort();
            }
            return dt;
        }