twitter api test (ko for now)

twitterapitest.cs

        private string ConsumerKey = "lEmrWQ24XXXXXXXXXXDOGMFTT";
        private string ConsumerSecret = "0soZwdgLq2s0AXXXXXXXXXXXXXXXXXXXXrN8UDq8zZbftLGPY0";

        private void button1_Click(object sender, EventArgs e)
        {
            string strBearerRequest = HttpUtility.UrlEncode(this.ConsumerKey) + ":" + HttpUtility.UrlEncode(this.ConsumerSecret);
            strBearerRequest = System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(strBearerRequest));

            HttpWebRequest req = WebRequest.Create("https://api.twitter.com/oauth2/token") as HttpWebRequest;
            req.Method = "POST";
            req.UserAgent = "IchimokuTrader77";
            req.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
            req.Headers.Add("Authorization", "Basic " + strBearerRequest);
            //req.Headers[HttpRequestHeader.AcceptEncoding] = "gzip";
            var reqBody = Encoding.UTF8.GetBytes("grant_type=client_credentials");
            req.ContentLength = reqBody.Length;
            Stream r = req.GetRequestStream();
            r.Write(reqBody, 0, reqBody.Length);
            r.Close();

            string respBody = "";
            using (var resp = req.GetResponse().GetResponseStream())
            {
                var respR = new StreamReader(resp);
                respBody = respR.ReadToEnd();
            }
            textBox1.Text = respBody;
        }