C#

private void PdfReport(string address)
        {
            //Load the stream from the local system.

            PdfSource = new FileStream(address, FileMode.Open);
        }

class AsyncResponse
    {
        public AsyncResponse()
        {
            test2();
            Console.ReadKey();
        }

        public void test2()
        {
      
            for (int i = 0; i < 100; i++)
            {
                string url = "https//www.google.com";
   
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.BeginGetResponse(new AsyncCallback(FinishWebRequest), request);
            }
            
        }

        private void FinishWebRequest(IAsyncResult result)
        {       
                HttpWebResponse response = (result.AsyncState as HttpWebRequest).EndGetResponse(result) as HttpWebResponse;

                Console.WriteLine("Finished");
        }

}

// Create a message
public class LoggedInUserRequestMessage : RequestMessage<User>
{
}

// Register the receiver in a module
WeakReferenceMessenger.Default.Register<MyViewModel, LoggedInUserRequestMessage>(this, (r, m) =>
{
    // Assume that "CurrentUser" is a private member in our viewmodel.
    // As before, we're accessing it through the recipient passed as
    // input to the handler, to avoid capturing "this" in the delegate.
    m.Reply(r.CurrentUser);
});

// Request the value from another module
User user = WeakReferenceMessenger.Default.Send<LoggedInUserRequestMessage>();

private void dataPager_OnDemandLoading(object sender, Syncfusion.UI.Xaml.Controls.DataPager.OnDemandLoadingEventArgs args)
{
    List<Equipment> data;
    using (var _sqliteContext = new SQLiteContext())
    {
        data = _sqliteContext.Equipments.Include(x => x.CostCenter).Skip(args.StartIndex).Take(args.PageSize).ToList();
    }
    dataPager.LoadDynamicItems(args.StartIndex, data);
    //resetting cache for all pages.
    (dataPager.PagedSource as PagedCollectionView).ResetCache();
}

private void dataPager_OnDemandLoading(object sender, Syncfusion.UI.Xaml.Controls.DataPager.OnDemandLoadingEventArgs args)
        {
            BackgroundWorker worker = new BackgroundWorker();
            worker.WorkerReportsProgress = false;

            worker.DoWork += worker_DoWork;
            worker.RunWorkerAsync();

        }

void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            List<Equipment> data;
            using (var _sqliteContext = new SQLiteContext())
            {
                data = _sqliteContext.Equipments.Include(x => x.CostCenter).Skip(args.StartIndex).Take(args.PageSize).ToList();
            }
            dataPager.LoadDynamicItems(args.StartIndex, data);
            //resetting cache for all pages.
            (dataPager.PagedSource as PagedCollectionView).ResetCache();
        }