Uri uri = new Uri("//www.microsoft.com");
            HttpClientHandler handler = new HttpClientHandler();
            handler.CookieContainer = new CookieContainer();

            handler.CookieContainer.Add(uri, new Cookie("name", "value")); // Adding a Cookie
            HttpClient client = new HttpClient(handler);
            HttpResponseMessage response = await client.GetAsync(uri);
            CookieCollection collection = handler.CookieContainer.GetCookies(uri); // Retrieving a Cookie

       　　  Uri uri = new Uri(GetString(Resource.String.apiHost));
            HttpClientHandler handler = new HttpClientHandler();
            handler.CookieContainer = new CookieContainer();
            handler.CookieContainer.Add(uri, new Cookie("ASP.NET_SessionId", InMemory.SessionID)); // Adding a Cookie

            using (var http = new HttpClient(handler))
            {
                var content = new FormUrlEncodedContent(new Dictionary<string, string>() { });
                var response = http.PostAsync(GetString(Resource.String.apiHost) + "/Test/CurrentTaskListApi", content);

                var obj = JsonConvert.DeserializeObject<List<Task_Info>>(response.Result.Content.ReadAsStringAsync().Result);
                listView.Adapter = new Task_InfoListAdapter(this, obj);
            }