using System;

using System.Collections.Generic;

using System.Linq;      

public class Program

{

    public static void Main()

    {

        var parser=new Parser();

        string ip="88.99.666.666,44.55.66";

        Console.WriteLine(parser.Parse(ip));

    }

}

public class Parser{

public string Parse(string ipAddress)

        {

            string defaultIp = "127.0.0.1";

            ipAddress = ipAddress.Trim();

​

            if (string.IsNullOrEmpty(ipAddress))

            {

                return defaultIp;

            }

​

            try

            {

                var ipAddressList = ipAddress.Split(',');

                if (ipAddressList.Length > 1)

                {

                    return ipAddressList[0];

                }

                else

                {

                    return ipAddress;

                }

            }

            catch (Exception)

            {

                return defaultIp;

            }

​

        }}