C# - Send Message to Slack

using Newtonsoft.Json;

https://yourteem.slack.com/services/new/incoming-webhook


        static void Main(string[] args)
        {
            const string url = "https://hooks.slack.com/services/.../.../...";

            SlackClient client = new SlackClient(url);

            client.PostMessage(username: "user",
                       text: "THIS IS A TEST MESSAGE! SQUEEDLYBAMBLYFEEDLYMEEDLYMOWWWWWWWW!",
                       channel: "#general");
        }

public class SlackClient
        {
            private readonly Uri _uri;
            private readonly Encoding _encoding = new UTF8Encoding();

            public SlackClient(string urlWithAccessToken)
            {
                _uri = new Uri(urlWithAccessToken);
            }

            //Post a message using simple strings
            public void PostMessage(string text, string username = null, string channel = null)
            {
                Payload payload = new Payload()
                {
                    Channel = channel,
                    Username = username,
                    Text = text
                };

                PostMessage(payload);
            }

            //Post a message using a Payload object
            public void PostMessage(Payload payload)
            {
                string payloadJson = JsonConvert.SerializeObject(payload);

                using (WebClient client = new WebClient())
                {
                    NameValueCollection data = new NameValueCollection();
                    data["payload"] = payloadJson;

                    var response = client.UploadValues(_uri, "POST", data);

                    //The response text is usually "ok"
                    string responseText = _encoding.GetString(response);
                }
            }
        }

        //This class serializes into the Json payload required by Slack Incoming WebHooks
        public class Payload
        {
            [JsonProperty("channel")]
            public string Channel { get; set; }

            [JsonProperty("username")]
            public string Username { get; set; }

            [JsonProperty("text")]
            public string Text { get; set; }
        }
    }