using Windows.Data.Pdf;

        private async Task RenderPDFPage(string pdfFileName)
         {
             try
             {
                 StorageFile pdfFile = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(pdfFileName);
                 _pdfDocument = await PdfDocument.LoadFromFileAsync(pdfFile);
                 if (_pdfDocument != null && _pdfDocument.PageCount > 0)
                 {
                     test.Text = "Success";
                 }
             }
             catch (Exception err)
             {
                 test.Text = "Error: " + err.Message;
             }
         }