获取IP地址，并且可以获取该ip的地区源码

js就两行代码就可以搞定：

  <script language="javascript" type="text/javascript" src="http://fw.qq.com/ipaddress" charset="gb2312"></script> 
  <script>document.write("你的IP是："+IPData[0]+"，来自："+IPData[2],IPData[3]);</script>

 

C#代码借助WebClient类来实现：

public static string GetUserLocation()
        {
            try
            {
                WebClient webGetting = new WebClient();
                string userIP = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
                string ipQueryResult = webGetting.DownloadString("http://www.ip.cn/getip.php?action=queryip&ip_url=" + userIP);
                string startString = @"来自：";
                int startIndex = ipQueryResult.LastIndexOf(startString) + startString.Length;
                int endIndex = ipQueryResult.LastIndexOf(@" ", startIndex);
                return ipQueryResult.Substring(startIndex, ipQueryResult.Length - startIndex);
            }
            catch
            {
                return string.Empty;
            }