public async Task <ActionResult> IndexAsync()
        {
            Stopwatch watch = new Stopwatch();

            watch.Start();
            ContentManagement service = new ContentManagement();
            var   contentTask         = service.GetContentAsync();
            var   numberTask          = service.GetNumbreAsync();
            await contentTask;
            await numberTask;

            watch.Stop();
            ViewBag.Milliseconds = watch.ElapsedMilliseconds;
            return(View());
        }