private void button1_Click(object sender, EventArgs e)
        {
            NicoVideoAPI nvapi = new NicoVideoAPI();

            if(!nvapi.Login(textBox1.Text, textBox2.Text))
            {
                MessageBox.Show("Invaild ID or Password. Please try again.");
                return;
            }

            id = textBox1.Text;
            pw = textBox2.Text;

            this.Close();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Length < 16)
                return;

            if (textBox1.Text.Substring(7, 16) == "www.nicovideo.jp")
            {
                //not logged in try login
                if (Properties.Settings.Default.NICOVIDEO_ID == string.Empty)
                {
                    Login nicolg = new Login();
                    nicolg.ShowDialog();

                    if (nicolg.id == null || nicolg.pw == null)
                        return;

                    Properties.Settings.Default.NICOVIDEO_ID = nicolg.id;

                    Properties.Settings.Default.NICOVIDEO_PW_ENCRYPT = EnDecryptor.EncryptString(EnDecryptor.ToSecureString(nicolg.id));

                    Properties.Settings.Default.Save();
                }

                //logged IN!

                string id = Properties.Settings.Default.NICOVIDEO_ID;
                string pass = EnDecryptor.ToInsecureString(EnDecryptor.DecryptString(Properties.Settings.Default.NICOVIDEO_PW_ENCRYPT));

                Uri u = new Uri(textBox1.Text);
                string videoid = u.Segments.Last();

                NicoVideoAPI nvapi = new NicoVideoAPI();
                nvapi.Login(id, pass);

                DownloadDialog dd = new DownloadDialog();
                dd.DOWNLOAD_URL = textBox1.Text;
                dd.cookie = nvapi.getCookie();
                dd.VIDEO_ID = videoid;

                dd.ShowDialog();

                dd.Dispose();

            }
        }