How to batch print PDF in WPF PDFViewer control?

char[] charSplitter = new char[] { '/' };
//Get the PDF files from the directory
files = Directory.GetFiles("../../Data/", "*.pdf");
foreach (string file in files)
{
    //Splitting the file name from the file path
    string[] fileName = file.Split(charSplitter);
    //Adding the file into the list view
    list.Items.Add(fileName[3]);
}
 
if (list.SelectedItems.Count > 0)
{
    for (int i = 0; i < list.SelectedItems.Count; i++)
    {
        string fileName = list.SelectedItems[i].ToString();
        for (int j = 0; j < files.Length; j++)
        {
            if (files[j].Contains(fileName))
            {
                //Initialize the PdfLoadedDocument
                ldoc = new PdfLoadedDocument(files[j]);
                //Load the PdfDocument into PdfViewerControl/PdfDocumentView
                pdfViewer.Load(ldoc);
                //Silent print the PDF document
                pdfViewer.Print();
                //Unload the PdfViewerControl after printing
                pdfViewer.Unload();
                //Close the PdfLoadedDocument
                ldoc.Close(true);
             }
         }
     }
}