1. HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://ip.chinaz.com/getip.aspx");
2. HttpWebResponse response = (HttpWebResponse)request.GetResponse();
3. Stream recStream = response.GetResponseStream();
4. Encoding gb2312 = Encoding.GetEncoding("gb2312");
5. StreamReader sr = new StreamReader(recStream, gb2312);
6. String content = sr.ReadToEnd();
7.  
8. string s = content;
9. int i = s.IndexOf("{ip:'") + 5;
10. int j = s.IndexOf("',");
11. string str = s.Substring(i, j - i + 0);
12. hqip = str;