C# webapi POST melalui program konsol

Saya memiliki api web yang berhasil saya akses melalui browser :-

https://127.0.0.1:8443/ncrApi

Saya mencoba membuat program konsol sederhana di C# menggunakan VS2015 untuk mengirim data dan menerima respons menggunakan http POST.

Inilah yang saya miliki sejauh ini: -

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;

namespace WebSample
{

    class ApiSendData
    {
        public string UserID { get; set;}  // username 
        public string Password { get; set;}  // password for the webapi

        public string ApiFunction { get; set; }
        public string DppName { get; set; }
        public string ClearData { get; set; }
        public string DppVersion { get; set; }
    }



    class Program
    {
        static void Main(string[] args)
        {
            // The Main function calls an async method named RunAsync 
            // and then blocks until RunAsyncc completes.
            RunAsync().Wait();
        }

        static async Task RunAsync()
        {
            using (var client = new HttpClient())
            {

                //specify to use TLS 1.2 as default connection
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

                // This code sets the base URI for HTTP requests, 
                // and sets the Accept header to "application/json", 
                // which tells the server to send data in JSON format.
                client.BaseAddress = new Uri("https://localhost:8443/");
                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));


                // HTTP POST
                var datatobeSent = new ApiSendData()
                                    {
                                        UserID = "xxxx",
                                        Password = "yyyy",
                                        ApiFunction ="NcrSecureData",
                                        DppName ="CSampleCustomer",
                                        DppVersion ="Latest",
                                        ClearData ="1234567890",
                                        ResultType = "JSON"
                                    };

                HttpResponseMessage response = await client.PostAsJsonAsync("ncrApi", datatobeSent);

                if (response.IsSuccessStatusCode)
                {
                    // Get the URI of the created resource.
                    Uri ncrUrl = response.Headers.Location;

                    // do whatever you need to do here with the returned data //


                }
            }
        }
    }
}

Dalam variabel respons saya, saya mendapatkan pesan 200 OK http 1.1, dengan tipe konten = aplikasi/json dan panjang konten = 174... tetapi tidak ada data aktual yang diterima...

variabel ncrUrl juga nol....

Saya bertanya-tanya apakah saya memerlukan pernyataan tambahan di program konsol saya untuk menerima data?

Inilah yang saya ikuti:- http://www.asp.net/web-api/overview/advanced/calling-a-web-api-from-a-net-client