public async Task<LoginUser[]> GetUserAsync()
    {

        var client = new System.Net.Http.HttpClient();
        client.BaseAddress = new Uri("http://developer-platform.com/dutyfreebuzz/web_services/Login");
         StringContent str = new StringContent("username=admin&password=12345", Encoding.UTF8, "application/x-www-form-urlencoded");
         var response = await client.PostAsync(new Uri("http://developer-platform.com/dutyfreebuzz/web_services/Login/loginJSON"), str);
         var loginJson = await response.Content.ReadAsStringAsync();
         Rootobject rootobject = new Rootobject();
            if (loginJson != "")
            {
                //rootobject = JsonConvert.DeserializeObject<Rootobject>(loginJson);
            }
            //return rootobject.loginusers;

    }