How to convert Word document to PDF in UWP

<Page
    x:Class="WordToPDF.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:WordToPDF"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <Button x:Name="button" Content="Generate PDF" Click="OnButtonClicked" HorizontalAlignment="Center" VerticalAlignment="Center"/>
    </Grid>
</Page>

using Syncfusion.DocIO.DLS;
using Syncfusion.DocIORenderer;
using Syncfusion.Pdf;

private async void OnButtonClicked(object sender, RoutedEventArgs e)
{
    //Creates an instance of WordDocument Instance (Empty Word Document)
    WordDocument wordDocument = new WordDocument();
    //Add a section and a paragraph in the empty document
    wordDocument.EnsureMinimal();
    //Append text to the last paragraph of the document
    wordDocument.LastParagraph.Text = "Adventure Works Cycles, the fictitious company on which the" +
" AdventureWorks sample databases are based, is a large, multinational manufacturing company. ";
    //Instantiation of DocIORenderer for Word to PDF conversion
    DocIORenderer render = new DocIORenderer();
    //Converts Word document into PDF document
    PdfDocument pdfDocument = render.ConvertToPDF(wordDocument);
    //Releases all resources used by the Word document and DocIO Renderer objects
    render.Dispose();
    wordDocument.Dispose();
    //Saves the PDF file
    MemoryStream outputStream = new MemoryStream();
    pdfDocument.Save(outputStream);
    //Closes the instance of PDF document object
    pdfDocument.Close();
    outputStream.Position = 0;
    //Save the PDF file
    SavePDF(outputStream);
}
 
private async void SavePDF(Stream outputStream)
{
    StorageFile stFile;
    if (!(Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons")))
    {
      FileSavePicker savePicker = new FileSavePicker();
      savePicker.DefaultFileExtension = ".pdf";
      savePicker.SuggestedFileName = "Sample";
      savePicker.FileTypeChoices.Add("Adobe PDF Document", new List<string>() { ".pdf" });
      stFile = await savePicker.PickSaveFileAsync();
    }
    else
    {
      StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
stFile = await local.CreateFileAsync("Sample.pdf", CreationCollisionOption.ReplaceExisting);
    }
    if (stFile != null)
    {
      Windows.Storage.Streams.IRandomAccessStream fileStream = await stFile.OpenAsync(FileAccessMode.ReadWrite);
      Stream st = fileStream.AsStreamForWrite();
      st.SetLength(0);
      st.Write((outputStream as MemoryStream).ToArray(), 0, (int)outputStream.Length);
      st.Flush();
      st.Dispose();
      fileStream.Dispose();
      MessageDialog msgDialog = new MessageDialog("Do you want to view the Document?", "File created.");
      UICommand yesCmd = new UICommand("Yes");
      msgDialog.Commands.Add(yesCmd);
      UICommand noCmd = new UICommand("No");
      msgDialog.Commands.Add(noCmd);
      IUICommand cmd = await msgDialog.ShowAsync();
      if (cmd == yesCmd)
      {
          // Launch the retrieved file
          bool success = await Windows.System.Launcher.LaunchFileAsync(stFile);
      }
    }
}