using System;

using System.Collections.Generic;

using System.Net.Http;

using System.Threading.Tasks;

using Newtonsoft.Json;

​

public class MandrillClient

{

        private readonly HttpClient httpClient;

        private readonly string apiKey;

        private readonly string templateName;

    public MandrillClient(HttpClient httpClient)

        {

            this.httpClient = httpClient;

            apiKey = Environment.GetEnvironmentVariable("MandrillApiKey");

            templateName = Environment.GetEnvironmentVariable("MandrillTemplateName");

        }

     public async Task<string> CheckMailStatus(string mailId)

        {

            var data = new Dictionary<string, string> {

                { "key", apiKey },

                { "id", mailId },

            };

            var json = JsonConvert.SerializeObject(data);

            var stringContent = new StringContent(json);

​

            //HTTP-Post request

            HttpResponseMessage response = await httpClient.PostAsync("/api/1.0/messages/info", stringContent);

            if (response.IsSuccessStatusCode)

            {

                var responseString = await response.Content.ReadAsStringAsync();

                return responseString.Trim();

            }

            else

            {

                throw new Exception($"{response.ReasonPhrase},{response.StatusCode}");                    

            }

     }

}