private void Bw_StartTestCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            string[]      param1 = e.Result as string[];
            ProxyTestList lst    = new ProxyTestList(Convert.ToInt32(param1[0]), param1[1].ToString(), param1[2].ToString(), param1[3].ToString());

            laoder_space.Children.Clear();
            //list_view.Children.Clear();
            list_view.Children.Add(lst);
        }
        public void populateList(string[] pr, string url)
        {
            var count = 0;

            list_view.Children.Clear();
            foreach (var p in pr)
            {
                if (p != null && p != "")
                {
                    count++;
                    try
                    {
                        //WebClient client = new WebClient();
                        //WebProxy proxy1 = new WebProxy(p.Split(':')[0] + ":" + p.Split(':')[1], true);
                        //proxy1.Credentials = new NetworkCredential(p.Split(':')[2], p.Split(':')[3]);
                        ////proxy1.UseDefaultCredentials = true;
                        //WebRequest.DefaultWebProxy = proxy1;
                        //client.Proxy = proxy1;
                        //if (client.IsBusy) {
                        //    System.Threading.Thread.Sleep(2000);
                        //}
                        //else{
                        //    var s = client.Headers;
                        //    string str = client.DownloadString(url);
                        //}

                        BackgroundWorker bw = new BackgroundWorker();
                        bw.DoWork                    += Bw_StartTest;
                        bw.RunWorkerCompleted        += Bw_StartTestCompleted;
                        bw.WorkerSupportsCancellation = true;
                        //Parameter you need to work in Background-Thread for example your strings
                        string[] param = new[] { p, url, count.ToString() };

                        //Start work
                        bw.RunWorkerAsync(param);
                    }
                    catch (Exception ex)
                    {
                        ProxyTestList lst = new ProxyTestList(count, p, url, ex.Message);
                        list_view.Children.Clear();
                        list_view.Children.Add(lst);
                    }
                }
            }
        }