public void SubmitData()
        {
            try
            {
                string user = textBox1.Text;
                string pass = textBox2.Text;

                ASCIIEncoding encoding = new ASCIIEncoding();
                string postData = "data%5BUser%5D%5Buserid%5D=" + user + "&data%5BUser%5D%5Bpassword%5D=" + pass + "&submit=Sign+in";
                byte[] data = encoding.GetBytes(postData);

                WebRequest request = WebRequest.Create("https://vpn.hidemyass.com/vpncontrol/signin");
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = data.Length;

                Stream stream = request.GetRequestStream();
                stream.Write(data, 0, data.Length);
                stream.Close();

                WebResponse response = request.GetResponse();
                stream = response.GetResponseStream();

                StreamReader sr = new StreamReader(stream);

                string final_reponse = sr.ReadToEnd();

                Regex r = new Regex(@"Invalid login or password!");
                Match m = r.Match(final_reponse);

                MessageBox.Show(m.Value);


                sr.Close();
                stream.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error: " + ex.Message);
            }
        }