How to implement colspan and rowspan in WPF app?

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C#

.NET

WPF

MVVM

I have WPF app and I want to implement colspan and rowspan in my code. I used iText version 7 for expoting the data into PDF. However PdfPCell doesn't recognized in order to use the colspan and rowspan method. Is there any way to solve this? My goal is actually to create main header along with subheader in my table.


What I have tried:

using iText.IO.Font.Constants;
using iText.Kernel.Font;
using iText.Kernel.Geom;
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using Microsoft.Win32;
using System.Diagnostics;
using System.Windows;

namespace ITextPdf.UI
{
   /// <summary>
   /// Interaction logic for MainWindow.xaml
   /// </summary>
   public partial class MainWindow : Window
   {
      public MainWindow()
      {
         InitializeComponent();
      }

      private void Export_Btn(object sender, RoutedEventArgs e)
      {
         SaveFileDialog dlg = new SaveFileDialog
         {
            DefaultExt = ".pdf",
            Filter = "Adobe PDF Files(*.pdf)|*.pdf",
            FilterIndex = 1
         };

         string fileName = string.Empty;

         if (dlg.ShowDialog() == true)
         {
            fileName = dlg.FileName;

            PdfWriter writer = new PdfWriter(fileName);
            PdfDocument pdf = new PdfDocument(writer);

            PdfFont font = PdfFontFactory.CreateFont(StandardFonts.HELVETICA);
            PdfFont bold = PdfFontFactory.CreateFont(StandardFonts.HELVETICA_BOLD);

            Document document = new Document(pdf, PageSize.LETTER);
            document.SetMargins(20, 20, 20, 20);
            document.Add(new Paragraph("General Ledger")
               .SetTextAlignment(iText.Layout.Properties.TextAlignment.CENTER)
               .SetFontSize(18)
               .SetFont(bold)
               .SetMarginBottom(-8));
            document.Add(new Paragraph("Naawan, Misamis Oriental")
               .SetTextAlignment(iText.Layout.Properties.TextAlignment.CENTER)
               .SetFontSize(14)
               .SetFont(font)
               .SetMarginBottom(20));

            var table = new Table(new float[] { 80, 120, 80, 80, 80 });
            table.SetMinWidth(100)
               .SetHorizontalAlignment(iText.Layout.Properties.HorizontalAlignment.CENTER)
               .SetFontSize(10);
            table.AddHeaderCell("Date");
            table.AddHeaderCell("Particulars");
            table.AddHeaderCell("Debit");
            table.AddHeaderCell("Credit");
            table.AddHeaderCell("Total Amount");
            table.AddCell("1/1/17");
            table.AddCell("Beginning Balance");
            table.AddCell("100.00");
            table.AddCell("");
            table.AddCell("100.00");
            table.AddCell("");
            table.AddCell("");
            table.AddCell("");
            table.AddCell("300.00");
            table.AddCell("200.00");

            document.Add(table);
            document.Close();
            Process.Start(fileName);
         }
      }
   }
}