notifySlack_DocumentRelease.cs

// retrieve the document name
String documentName = this.getProperty("name");

// retrieve the document id
String documentID = this.getID();

// create the POST web request
var httpWebRequest = (HttpWebRequest) WebRequest.Create("https://hooks.slack.com/services/XXXXX/XXXXX/XXXXXXXXXX");
httpWebRequest.ContentType = "text/json";
httpWebRequest.Method = "POST";

// send message content
using(var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream())) {
    string BaseUrl = HttpContext.Current.Request.Url.Scheme + "://" + HttpContext.Current.Request.Url.Authority + HttpContext.Current.Request.ApplicationPath.Replace("Server","").TrimEnd('/') + "/";
    string ItemUrl = "Client/default.aspx?StartItem={0}:{1}";
    string FullUrl = BaseUrl + String.Format(ItemUrl, this.getType(), this.getID());
    var obj = new Dictionary<string, string>
            {
                { "title", "Document Release"},
                { "title_link", FullUrl},
                { "text", "Document " + documentName +" has been released. \n   <"+FullUrl+"|Click here>" }
            };

    var jsSerializer = new  System.Web.Script.Serialization.JavaScriptSerializer();
    var json = jsSerializer.Serialize(obj);
    streamWriter.Write(json);
    streamWriter.Flush();
    streamWriter.Close();
}

// Get web service call response
var httpResponse = (HttpWebResponse) httpWebRequest.GetResponse();
using(var streamReader = new StreamReader(httpResponse.GetResponseStream())) {
    var result = streamReader.ReadToEnd();
}

return this;