GetSentimentClient.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;
using System.Net.Http.Headers;


namespace dotnet_integration
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri("<ACCESS-URL>");
                client.DefaultRequestHeaders.TryAddWithoutValidation("<ACCESS-KEY-HEADER>", 
                    "<ACCESS-KEY>");

                var text = "The food was great, but the service was slow.";

                var parameters = new FormUrlEncodedContent(new[]
                {
	new KeyValuePair<string, string>("text", text),
                    new KeyValuePair<string, string>("categories", "1"),
                    new KeyValuePair<string, string>("sentiment", "1"),
                    new KeyValuePair<string, string>("annotate", "1")
                });

                var response = client.PostAsync("", parameters).Result;

                if (response.IsSuccessStatusCode)
                {
                    var responseBody = response.Content.ReadAsStringAsync().Result;
                    Console.WriteLine(responseBody);
                    Console.ReadLine();
                }
                else
                {
                    Console.WriteLine("Response status code:" + response.StatusCode);
                    Console.ReadLine();
                }
            }
        }
    }
}