private void Page_Load(object sender, System.EventArgs e)
  {
  
   WebRequest wreq=WebRequest.Create("http://weather.yahoo.com/forecast/CHXX0133_c.html");  

   HttpWebResponse wresp=(HttpWebResponse)wreq.GetResponse();  

   string HTML ="";  
   Stream s=wresp.GetResponseStream();  

   StreamReader objReader = new StreamReader(s,System.Text.Encoding.GetEncoding("GB2312"));  


   string sLine = "";  
   int i = 0;  

   while (sLine!=null)  
   {  
    i  ;  
    sLine = objReader.ReadLine();  
    if (sLine!=null)  
     HTML  = sLine;  
   }  

   String temp= "";  
   int start,stop;  
  
  // string aa="<div class=\"five-day-forecast night\" style=\"border:none;\">";
  
  //string aa="<div class=\"five-day-forecast\" style=\"border:none;\">";

   string aa="<table><th>Today</th>";
   start = HTML.IndexOf(aa,0,HTML.Length);  

   stop = HTML.IndexOf("</table>",start) 8;  

   temp = HTML.Substring(start, stop - start);  

   this.Weather2.Text=temp;
      string cc="<tr class=\"titles\"><td>";
//    
       int aa1 =temp.IndexOf(cc,0,temp.Length);  

   int bb=temp.IndexOf("</td>",aa1);

   this.Weather2.Text=temp.Substring(aa1, bb - aa1).ToString();  
  
   string ee="<tr class=\"temps\">";

   int aa2 =temp.IndexOf(ee,0,temp.Length);  

   int bb1=temp.IndexOf("</td>",aa2);

   this.Label1.Text=temp.Substring(aa2, bb1 - aa2).ToString();  

  
   // 在此处放置用户代码以初始化页面
  }