Simple Slack webhook in C#

SlackWebhook.cs

using System;
using Newtonsoft.Json;
using System.Text;
using System.Net;
using System.Collections.Specialized;

public class SlackWebhook 
{
	private readonly Encoding _encoding = new UTF8Encoding();
	public void PostMessage()
	{
		var uri = new Uri("https://hooks.slack.com/services/xxxAccessTokenxxx");
		var message = new { text = "Webhook is working"};
		string payloadJson = JsonConvert.SerializeObject(message);

		using (WebClient client = new WebClient())
		{
			NameValueCollection data = new NameValueCollection();
			data["payload"] = payloadJson;
			var response = client.UploadValues(uri, "POST", data);
			string responseText = _encoding.GetString(response);
		}
	}
}

This is a basic slack webhook integration using C#. Use the slack documentation to format your messages.