Slack.cs

            using (WebClient webClient = new WebClient())
            {
                webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
                byte[] request = System.Text.Encoding.UTF8.GetBytes("payload=" + JsonConvert.SerializeObject(message));
                byte[] response = webClient.UploadData(this._webHookUri, "POST", request);
            }