Trouble converting a piece of CURL to C#
===

I have the following CURL that I am trying to convert to C#. I have no CURL experience whatsoever.

    $ch = curl_init();
        curl_setopt_array($ch, array(
            CURLOPT_URL            => 'https://api.lanoba.com/authenticate',
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => array(
                'token'      => $_POST['token'],
                'api_secret' => 'YOUR-API-SECRET'
            )
        ));

Thus far I have come up with this:

    //Object to create a JSON object
    public class LanobaJSONObject
    {
        public string token { get; set; }
        public string api_secret { get; set; }
    }

    public void DoAuthenticationCheck()
    {
        

        var token = Request["token"].ToString();

            var jsonObject = new LanobaJSONObject()
            {
                token = token,
                api_secret = "YOUR-API-SECRET"
            };

            var jsonVal = Json(jsonObject, JsonRequestBehavior.AllowGet);

            Uri address = new Uri("https://api.lanoba.com/authenticate");
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(address);
            ServicePointManager.ServerCertificateValidationCallback = delegate
            {
                return
                    true; //always trust the presented cerificate
            };
            request.Method = "post";
            request.ContentType = "text/json";
            string response = null;
            using (var streamWriter = new StreamWriter(request.GetRequestStream()))
            {
                streamWriter.Write(jsonVal);
            }

            using (HttpWebResponse resp = request.GetResponse() as HttpWebResponse)
            {
                var reader = new StreamReader(resp.GetResponseStream());
                response = reader.ReadToEnd();
            }
    //I keep getting an error code back from the provider with no real error description
    //so right now I am assuming that I am doing something wrong on my end
    
    }

Any help would be appreciated.