HttpWebRequest C# Browsergame Bot

Hi,

i have the following problem and it would be great if s.o. could help me.
I try to write a simple bot for a browsergame which uses the HttpWebRequest and Response classes from C#. Currently i try to log in with the following script but i only get back to the login page. When i try to catch a site for logged in members only i also only get the login page. There has to be a problem with the cookie but i don't know where :(

Code:

class HttpHelper
    {
        private CookieContainer cookieContainer = new CookieContainer();
        HttpWebRequest request;
        HttpWebResponse response;
        StreamReader sr;

        public string GetHtml(string Url)
        {
            request = (HttpWebRequest)HttpWebRequest.Create(Url);
            request.Referer = "http://s40.wurzelimperium.de";
            request.AllowAutoRedirect = true;
            request.ServicePoint.Expect100Continue = false;
            request.Timeout = 10000;
            request.CookieContainer = cookieContainer;
            request.Method = "GET";
            request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5";


            response = (HttpWebResponse)request.GetResponse();
            Console.WriteLine();
            sr = new StreamReader(response.GetResponseStream());
            string html = sr.ReadToEnd();
            sr.Close();
            response.Close();         

            return html;
        }

        public void Login()
        {
            HttpWebResponse res;
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("http://www.wurzelimperium.de/serverwahl_login.php");
            req.AllowAutoRedirect = true;
            req.Method = "POST";
            req.ServicePoint.Expect100Continue = false;
            req.Timeout = 10000;
            req.CookieContainer = cookieContainer;
            req.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3";
            req.ContentType = "application/x-www-form-urlencoded";


            ASCIIEncoding encoding = new ASCIIEncoding();
            byte[] loginDataBytes = encoding.GetBytes("server=server40&submitlogin=Einloggen&login=tobu&dummy=12346&pass=MTIzNDY%3D");
            req.ContentLength = loginDataBytes.Length;

            Stream stream = req.GetRequestStream();
            stream.Write(loginDataBytes, 0, loginDataBytes.Length);
            stream.Close();


            res = (HttpWebResponse)req.GetResponse();

            res.Close();
        }
    }

You can use the login data. Its only a test account with fake email.

I created a WPF-Project so that i can see the results.
Here my call:

Code:

Login()
webBrowser1.DocumentText = GetHtml("http://s40.wurzelimperium.de/garten_map.php")

But like said before, i only get the login page.

€dit:
I've tested it with other games. Works fine there. I've really no clue why it doesn't work there :mad:

Thorbardin