Logging in to Google programatically

Hi there!
I'm currently trying to write a little application to log into my Google account. Sadly I alsways get the following response to my http request:

"cookie functionality is turned off. Please turn it on."

Here's the code I'm using:

static void LoginTest (string userName, string password)
{
// Create a request using a URL that can receive a post.
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create (@"https://accounts.google.com/ServiceLoginAuth");
// Set the Method property of the request to POST.
request.Method = "POST";
// Enable Cookies
request.CookieContainer = new CookieContainer();
// Create POST data and convert it to a byte array.
string postData = String.Format (@"continue=https%3A%2F%2Fmarket.android.com%2Fpublish%2FHome&followup=https%3A%2F%2Fmarket.android.com%2Fpublish%2FHome&service=androiddeveloper&nui=1&dsh=&GALX=&pstMsg=1&dnConn=&timeStmp=&secTok=&Email={0}Passwd={1}&signIn=Sign+in", userName, password);
byte[] byteArray = Encoding.UTF8.GetBytes (postData);
// Set the ContentType property of the WebRequest.
request.ContentType = "application/x-www-form-urlencoded";
// Set the ContentLength property of the WebRequest.
request.ContentLength = byteArray.Length;
// Get the request stream.
Stream dataStream = request.GetRequestStream ();
// Write the data to the request stream.
dataStream.Write (byteArray, 0, byteArray.Length);
// Close the Stream object.
dataStream.Close ();


// Get the response.
HttpWebResponse response = (HttpWebResponse)request.GetResponse ();
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream ();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader (dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd ();
// Display the content.
Console.WriteLine (responseFromServer);
// Clean up the streams.
reader.Close ();
dataStream.Close ();
response.Close ();
}

Has anyone an idea of what's going wrong?
Thanks!