Problem with Cookies. logging into phpbb

Hi All.
I'm hoping somebody could help me out with this little problem I'm having, I've been at it for 8+ hours so far and just can't nail it.
The 2 blocks of code below I'm using to log into a fresh install of phpbb forums, and they work just fine.
The problem lies somewhere in the third block. (this one is just going back to the main page)
It doesn't pick up the cookies from the container.

private void forum_Login()
        {
            CookieContainer boardCookies = login("http://127.0.0.1/phpBB3/ucp.php?mode=login", this.login_user.Text, this.login_pass.Text);
            if (boardCookies != null)
            {
               MessageBox.Show("Logged in succeeded");
            }
            else
            {
             MessageBox.Show("Logged in Failed");
            }

public static CookieContainer login(string url, string username, string password)
        {
            if (url.Length == 0 || username.Length == 0 || password.Length == 0)
            {
                MessageBox.Show("Login Information missing");
                return null;
            }

            CookieContainer myContainer = new CookieContainer();

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.CookieContainer = new CookieContainer();

            // Set type to POST
            request.Method = "POST";
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)";
            request.ContentType = "application/x-www-form-urlencoded";
            request.AllowAutoRedirect = false;
            // Build the new header, this isn't a multipart/form, so it's very simple
            StringBuilder data = new StringBuilder();
            data.Append("username=" + Uri.EscapeDataString(username));
            data.Append("&password=" + Uri.EscapeDataString(password));
            data.Append("&login=Login");
            byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());

            // Set the content length in the request headers
            request.ContentLength = byteData.Length;

            Stream postStream;
            try
            {
                postStream = request.GetRequestStream();
            }
            catch (Exception e)
            {
                MessageBox.Show("Login - " + e.Message.ToString());
                return null;
            }

            // Write data
            postStream.Write(byteData, 0, byteData.Length);

            HttpWebResponse response;
            try
            {
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (Exception e)
            {
                MessageBox.Show("Login - " + e.Message.ToString());
                return null;
            }

            bool isLoggedIn = false;
            // Store the cookies
            foreach (Cookie c in response.Cookies)
            {

                Console.WriteLine("Cookie:");
                Console.WriteLine("{0} = {1}", c.Name, c.Value);
                Console.WriteLine("Domain: {0}", c.Domain);
                Console.WriteLine("Path: {0}", c.Path);
                Console.WriteLine("Port: {0}", c.Port);
                Console.WriteLine("Secure: {0}", c.Secure);

                Console.WriteLine("When issued: {0}", c.TimeStamp);
                Console.WriteLine("Expires: {0} (expired? {1})",
                    c.Expires, c.Expired);
                Console.WriteLine("Don't save: {0}", c.Discard);
                Console.WriteLine("Comment: {0}", c.Comment);
                Console.WriteLine("Uri for comments: {0}", c.CommentUri);
                Console.WriteLine("Version: RFC {0}", c.Version == 1 ? "2109" : "2965");

                // Show the string representation of the cookie.
                Console.WriteLine("String: {0}", c.ToString());
                if (c.Name.Contains("_u"))
                {
                    if (Convert.ToInt32(c.Value) > 1)
                    {
                        isLoggedIn = true;
                    }
                }
                myContainer.Add(c);
               
            }

            if (isLoggedIn)
            {
                return myContainer;
            }
            else
            {
                return null;
            }
        }

Now, this next bit is where I'm having the problems. I'm expecting the forum to accept the cookies I grabbed from when the above code logged in.. but it's not doing it, and just sees the "visit" as somebody not logged in.

private void button8_Click(object sender, EventArgs e)
        {

            CookieContainer boardCookies = new CookieContainer();
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://127.0.0.1/phpBB3");
            request.AllowAutoRedirect = true;
            request.CookieContainer = boardCookies;
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                foreach (Cookie cookie in response.Cookies)
                {
                    MessageBox.Show("name " + cookie.Name);
                    MessageBox.Show("value " + cookie.Value.ToString() );
                }
            }

Can anybody see where I'm going wrong??