потоки

[Cpluser]

Почему ето не работает?? и как правильно сделать???

private void button1_Click(object sender, EventArgs e)
        {
            List<string> list = new List<string>();
            StreamReader sr = new StreamReader("ssulki.txt", Encoding.GetEncoding(1251));

            DateTime dold = DateTime.Now;
            while (!sr.EndOfStream)
            {
                list.Add(sr.ReadLine());
                if (list.Count == 10)
                {
                    Thread newThread = new Thread(new ParameterizedThreadStart(potok));
                    newThread.Start(list);
                    list = new List<string>();
                }

            }
            sr.Close();
            TimeSpan sp = DateTime.Now - dold;
            MessageBox.Show(sp.TotalSeconds.ToString());
        }

        void potok(object l)
        {
            List<string> lis = (List<string>)l;
            WhitePrideWorldWide.HttpClient httpClient = new WhitePrideWorldWide.HttpClient();
            httpClient.encoding = Encoding.UTF8;
            string html = "";
            for (int i = 0; i < lis.Count; i++)
            {
                html = httpClient.Get(lis[i] + "/data/rss");
            }
        }