Internet check experiment

gistfile1.cs

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            if (!InternetConnection.HasProxy() && InternetConnection.HasInternet())
            {
                Console.WriteLine("Interent liberada");
            }
            else if (InternetConnection.HasProxy() && InternetConnection.HasInternet())
            {
                Console.WriteLine("Interent com proxy");
            }
            else
            {
                Console.WriteLine("Não tem internet " + InternetConnection.LastConnectionErro);
            }

            Console.ReadKey();
        }
    }
}

///////----------------------------------

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Security.Policy;
using System.Text;

namespace ConsoleApplication1
{
    public class InternetConnection
    {

        static readonly IWebProxy _proxy = WebProxy.GetDefaultProxy();

        public static ProxyProperts Proxy { get; private set; }
        public static string LastConnectionErro { get; private set; }

        public class ProxyProperts
        {
            public string Host { get; set; }
            public int Port { get; set; }
        }

        static InternetConnection()
        {
            var pr = ((WebProxy)_proxy);

            if (pr.Address != null && pr.Address.AbsoluteUri != string.Empty)
            {
                Proxy = new ProxyProperts { Host = pr.Address.Host, Port = pr.Address.Port };
            }

            if (string.IsNullOrEmpty(CheckIp()))
            {
                if (HasProxy())
                {
                    try
                    {
                        CheckInternet();
                    }
                    catch (WebException e)
                    {
                        LastConnectionErro = e.Message;
                    }
                }
            }

        }

        public static bool HasProxy()
        {
            return Proxy != null;
        }


        public static IWebProxy GetProxy()
        {
            return _proxy;
        }


        private static string CheckInternet()
        {

            using (var wc = new WebClient())
            {

                if (HasProxy()) wc.Proxy = GetProxy();

                string result = wc.DownloadString("http://checkip.dyndns.com");
                return ParseCheckResult(result);
            }

        }

        public static bool HasInternet()
        {
            return !string.IsNullOrEmpty(CheckIp());
        }

        public static string CheckIp()
        {

            string ipString;
            using (var wc = new WebClient())
            {

                if (HasProxy()) wc.Proxy = GetProxy();

                try
                {
                    string result = wc.DownloadString("http://checkip.dyndns.com");
                    return ParseCheckResult(result);
                }
                catch (Exception)
                {
                    ipString = string.Empty;
                }
            }
            return ipString;

        }

        private static string ParseCheckResult(string result)
        {
            try
            {
                string temp = result.Substring(result.IndexOf(":", System.StringComparison.Ordinal) + 2);
                temp = temp.Remove(temp.IndexOf("<", System.StringComparison.Ordinal));

                IPAddress address;
                if (!IPAddress.TryParse(temp, out address)) temp = string.Empty;

                return temp;
            }
            catch (Exception)
            {

                return string.Empty;
            }
        }
    }
}