using System;

 using System.Net;

 using System.Text.RegularExpressions;

 namespace Keleyi.Com

 {

     public class GetInternetIP

     {

         public static string GetIP()

         {

             using (var webClient = new WebClient())

             {

                 try

                 {

                     var temp = webClient.DownloadString("http://iframe.ip138.com/ic.asp");

                     var ip = Regex.Match(temp, @"\[(?<ip>\d+\.\d+\.\d+\.\d+)]").Groups["ip"].Value;

                     return !string.IsNullOrEmpty(ip) ? ip : null;

                 }

                 catch (Exception ex)

                 {

                     return ex.Message;

                 }

             }

         }

     }

 }