login to aukro.cz via c#

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C#

Hello,
I have a problem with logging in to the server www.aukro.cz,
Here I send how Iam trying a sign, I still can not find a solution, my intention is to log on and then bid at auction. Thanks for any advice regarding my problem with best regards, Jan

        string outurl="https://ssl.aukro.cz/enter_login.php";
        string session = "ZjZmOVBXCg4DBVMMVgBaVlMAUgkLV18GUgJSWlVWXFEABAULAVcKBwUHBQgCUQxWVwFVCgNVM2Q5Nw==";
        string global_login_hash = "19d1f857f0f84ab3cccec54ca9dcac707d55b9f7";
        string session_login_hash = "f192efd010b329a84c51cb22d6419623ae778718";
        string url = "YmI4OFxGRBFYTRdPQ0UeABcJSlcaUUo0MjBh";
        string cod = "OGZkZlVlNmJk";
        string version = "A";
        string user_login = "loginname";
        string user_password = "password";
        string commit = "Přihlásit";

        private void Login()
        {
            WebBrowser b = new WebBrowser();
            b.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(b_DocumentCompleted);
            b.Navigate(outurl);
        }
        private void b_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            WebBrowser b = sender as WebBrowser;
            string response = b.DocumentText;

            // unregisters the first event handler
            // adds a second event handler
            b.DocumentCompleted -= new WebBrowserDocumentCompletedEventHandler(b_DocumentCompleted);
            b.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(b_DocumentCompleted2);
string postData = string.Format("session={0}&global_login_hash={1}&session_login_hash={2}&url={3}&cod={4}&version={5}&user_login={6}&user_password={7}&submit_orange={8}", session, global_login_hash, session_login_hash, url, cod,version, user_login, user_password, commit);

            ASCIIEncoding enc = new ASCIIEncoding();

            b.Navigate(url, "", enc.GetBytes(postData), "Content-Type: application/x-www-form-urlencoded\r\n");
        }
        private void b_DocumentCompleted2(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            WebBrowser b = sender as WebBrowser;
            string response = b.DocumentText;

            if (response.Contains(user_login))
            {
                MessageBox.Show("Login Successful");
            }
            else { MessageBox.Show("error!"); }
        }