C#

private bool getCookie()
        {
            HttpWebRequest request;
            try
            {
                string dest = "http://" + ip;
                string p = "username=un&password=pass";
                MessageBox.Show("Sending a request to: " + dest + " with creds: " + p);
                
                request = (HttpWebRequest)WebRequest.Create(dest);
                request.CookieContainer = cookieJar;

                request.Credentials = CredentialCache.DefaultCredentials;

                //Used to establish posting
                request.Method = "POST";

                Byte[] byte1 = Encoding.ASCII.GetBytes(p);

                //Set the content type of the data being posted.
                request.ContentType = "application/x-www-form-urlencoded";
                //Set the content length of the string being posted.
                request.ContentLength = byte1.Length;

                Stream newStream = request.GetRequestStream();
                newStream.Write(byte1, 0, byte1.Length);

                newStream.Close();
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message);
                MessageBox.Show("Please ensure correct IP address.");
                return false;
            }

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            if (response.Headers["Set-Cookie"] == null)
                return false;

            string[] cParams = response.Headers["Set-Cookie"].Split('=');
            string cName = cParams[0];
            string cValue = cParams[1];
            MessageBox.Show("Cookie name: " + cName + " Value: " + cValue);

            myCookie = new Cookie(cName, cValue);
            myCookie.Expires = DateTime.Now.AddHours(1);

            response.Cookies.Add(myCookie);
            response.Close();

            return r;
        }