private async void ButtonLoadPdf_Click(object sender, RoutedEventArgs e)
{
var Base64Data = await OpenAndConvert("9755___21107-8-1-MP10MP20-FEN.pdf");
//var Base64Data = await OpenAndConvert2("compressed.tracemonkey-pldi-09.pdf");
//var jsfunction = $"openPdfAsBase64('{Base64Data}')";
//await sender.InvokeScriptAsync("eval", new[] { jsfunction });
await PdfViewerControl.InvokeScriptAsync("openPdfAsBase64", new[] { Base64Data });
//await PdfViewerControl.InvokeScriptAsync("eval", new[] { jsfunction });
_pdfFileLoaded = true;
}