static void Download(Uri uri)
        {
            string fileName = Path.GetFileName(uri.LocalPath);

            Android.App.DownloadManager downloadManager = (Android.App.DownloadManager)Application.Context.GetSystemService("download");

            Android.App.DownloadManager.Request request = new Android.App.DownloadManager.Request(Android.Net.Uri.Parse(uri.AbsoluteUri));

            //Restrict the types of networks over which this download may proceed.
            request.SetAllowedNetworkTypes(Android.App.DownloadNetwork.Wifi | Android.App.DownloadNetwork.Mobile);
            //Set whether this download may proceed over a roaming connection.
            request.SetAllowedOverRoaming(false);
            //Set the title of this download, to be displayed in notifications (if enabled).
            //request.SetTitle(title);
            request.SetVisibleInDownloadsUi(false);

            //request.SetNotificationVisibility(DownloadVisibility.Hidden);
            #if DEBUG
            request.SetNotificationVisibility(DownloadVisibility.Visible);
            #else
            request.SetNotificationVisibility(DownloadVisibility.Hidden);
            #endif

            request.SetDestinationInExternalFilesDir(Application.Context, Android.OS.Environment.DirectoryDownloads, fileName);

            //Enqueue a new download and same the referenceId
            var id = downloadManager.Enqueue(request);

            MBDownloadManager.DownloadMonitor(id);
        }
        static long Download(Uri uri, string filename, string title, IDownloadUpdated2 notify)
        {
            Android.App.DownloadManager downloadManager = (Android.App.DownloadManager)Application.Context.GetSystemService("download");

            Android.App.DownloadManager.Request request = new Android.App.DownloadManager.Request(Android.Net.Uri.Parse(uri.AbsoluteUri));

            //Restrict the types of networks over which this download may proceed.
            request.SetAllowedNetworkTypes(Android.App.DownloadNetwork.Wifi | Android.App.DownloadNetwork.Mobile);
            //Set whether this download may proceed over a roaming connection.
            request.SetAllowedOverRoaming(false);
            //Set the title of this download, to be displayed in notifications (if enabled).
            request.SetTitle(title);
            request.SetVisibleInDownloadsUi(false);

            //request.SetNotificationVisibility(DownloadVisibility.Hidden);
                        #if DEBUG
            request.SetNotificationVisibility(DownloadVisibility.Visible);
                        #else
            request.SetNotificationVisibility(DownloadVisibility.Hidden);
                        #endif

            request.SetDestinationInExternalFilesDir(Application.Context, Android.OS.Environment.DirectoryDownloads, filename);

            //Enqueue a new download and same the referenceId
            var id = downloadManager.Enqueue(request);

            ThreadPool.QueueUserWorkItem(state =>
            {
                MBDownloadManager2.DownloadMonitor(id);
            });

            /*new Thread(() =>
             * {
             *      MBDownloadManager2.DownloadMonitor(id);
             *
             * }).Start();*/

            return(id);
        }