private void ResolveHostAdresses(object sender, RoutedEventArgs e)
        {
            string[] hostNames =
            {
                "www.microsoft.com",
                "www.apple.com", "www.google.com",
                "www.ibm.com", "cisco.netacad.net",
                "www.oracle.com", "www.nokia.com",
                "www.hp.com", "www.dell.com",
                "www.samsung.com", "www.toshiba.com",
                "www.siemens.com", "www.amazon.com",
                "www.sony.com", "www.canon.com",
                "www.alcatel-lucent.com", "www.acer.com",
                "www.motorola.com"
            };

            var parallerQuery = hostNames.AsParallel().Select(g => new
                {
                    host = g,
                    ips = Dns.GetHostAddresses(g)
                });

            var parallerQuery2 = from h in hostNames.AsParallel()
                                 select new
                                 {
                                     host = h,
                                     ips = Dns.GetHostAddresses(h)
                                 };
            //StringBuilder result = new StringBuilder();
            //foreach(string hostName in hostNames)
            //{
            //    result.Append(hostName + " => ");
            //    IPAddress[] ips = Dns.GetHostAddresses(hostName);
            //    foreach (IPAddress ip in ips)
            //        result.Append(ip.ToString());

            //    result.Append("\n");
            StringBuilder result = new StringBuilder();
            foreach (var adress in parallerQuery2)
            {
                result.Append(adress.host + " => ");
                foreach(var ip in adress.ips)
                    result.Append(ip.ToString() + "\n");
            }
            this.hostAdressesBox.Text = result.ToString();
        }