//Code snippet to consume Product Code Builder API using C#

//load required libraries
using System;
using System.Net.Http;
using System.Threading;
using System.Net;

namespace FDA
{
    public class Program
    {
        public static void Main(String[] args)
        {
            RestClient(); //async, passes through immediately
            Thread.Sleep(10000); //capture the output from RestClient()
        }

        static async void RestClient()
        {
            using (var client = new HttpClient())
            {
                //create signature
                DateTime dateTime = DateTime.Now;
                long signature = dateTime.Ticks;

                //specify to use TLS 1.2 as default connection
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
               
                //set headers
                client.DefaultRequestHeaders.Add("Authorization-Key", "Insert your Authorization-Key here");
                client.DefaultRequestHeaders.Add("Authorization-User", "Insert your Authorization-User here");

                //set url 
                client.BaseAddress = new Uri("https://www.accessdata.fda.gov/rest/?signature="+ signature);
           
                var api = "pcbapi/v1/product/name";
                client.DefaultRequestHeaders.Accept.Clear();

                //build the payload data
                var data = "payload=blood/plasma";
                var contentData = new StringContent(data, System.Text.Encoding.UTF8, "application/x-www-form-urlencoded");

                using (var r = await client.PostAsync(api, contentData))
                {
                    string result = await r.Content.ReadAsStringAsync();
                    Console.WriteLine(result);
                }
            }
        }

    }
}