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;                 }             }         }     } }