C#获取北京时间的问题，求解释，谢谢

/// 获取标准北京时间   
        /// /// </summary>      
        /// /// <returns></returns>   
        ///
         public static DateTime GetStandardTime()     
        {         
        /// //<?xml version="1.0" encoding="GB2312" ?>            
        //- <ntsc>           
        //- <time>         
        //  <year>2013</year>      
        //  <month>8</month>      
        //  <day>29</day>         
        //  <Weekday />  
        //  <hour>16</hour>      
        //  <minite>29</minite>      
        //  <second>12</second>        
        //  <Millisecond />      
        //  </time>        
        //  </ntsc>        
        DateTime dt;      
        WebRequest wrt = null;      
        WebResponse wrp = null;      
        try      
    {            
        wrt = WebRequest.Create("http://www.time.);  
        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;   

          问题是  这个程序只执行到这，下面就不执行了，怎么回事啊，急求
         
            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("2013-1-1");  
        }         
        catch (Exception)     
        {         
            return DateTime.Parse("2013-1-1");   
        }         
        finally   
        {           
            if (wrp != null)           
                wrp.Close();        
            if (wrt != null)         
                wrt.Abort();     
        }         
             return dt;   
         }