How to convert Excel worksheet to image in UWP?

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

using Syncfusion.XlsIO;
using Windows.Storage.Pickers;
using Windows.Storage;
using Syncfusion.XlsIORenderer;

//Create an instance of ExcelEngine.
using (ExcelEngine excelEngine = new ExcelEngine())
{
    //Initialize Application.
    IApplication application = excelEngine.Excel;
 
    //Set default version for application.
    application.DefaultVersion = ExcelVersion.Xlsx;
 
    Assembly assembly = typeof(MainPage).GetTypeInfo().Assembly;
    string path = "CreateXlsIOSample_UWP.Assets.sample.xlsx";
    Stream stream = assembly.GetManifestResourceStream(path);
                
    //Create a new workbook.
    IWorkbook workbook = application.Workbooks.Open(stream);
 
    IWorksheet worksheet = workbook.Worksheets[1];
    
    // Initialize XlsIORenderer
    application.XlsIORenderer = new XlsIORenderer();
 
    //Create a new memory stream to save the image.
    Stream imagestream = new MemoryStream();
 
    //Convert worksheet to image and save it to stream.
    worksheet.ConvertToImage(worksheet.UsedRange, imagestream);
    SaveImage(imagestream);
}
 
private async void SaveImage(Stream outputStream)
{
   StorageFile stFile;
   if (!(Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons")))
   {
      FileSavePicker savePicker = new FileSavePicker();
      savePicker.DefaultFileExtension = ".png";
      savePicker.SuggestedFileName = "Output";
      savePicker.FileTypeChoices.Add("png image", new List<string>() { ".png" });
      stFile = await savePicker.PickSaveFileAsync();
   }
   else
   {
       StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
       stFile = await local.CreateFileAsync("Output.png", 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);
        }
    }
}