For HTML2PDF and XML2PDF solution check our PDFDoc Scout ActiveX library instead

using System;
using System.Collections.Generic;
using System.Text;
using Bytescout.PDF;

namespace Adding_multiple_pages_with_page_numbers
{
class Program
{
static void Main(string[] args)
{
// Create main PDF Doc Engine
PDFDocEngine engine = new PDFDocEngine("", "");

// Add new document
Document document = engine.AddDocument();

// Add standard font
uint font = document.AddFontStandard(StandardFontType.Courier, FontEncodingType.WinAnsi);

for (int i = 0; i < 12; i++)
{
// Append new page to the document
Page page = document.AddPage(PageSizeType.A3, PageOrientationType.LandScape);

// Create new drawing
Drawing drawing = page.AddDrawing();

// Set Active Font
drawing.SetActiveFont(font, 50, false, false);

// Draw Text
drawing.PlaceText(drawing.Width / 2, 100, 0, string.Format("{0}", i + 1));

// Closing drawing on the page
drawing.Close();
}

document.Save("multiple_pages_with_page_numbers.pdf");
}
}
}

Download example source code: bytescoutpdf_add_number_to_pages_in_pdf.zip (10 KB)

For HTML2PDF and XML2PDF solution check our PDFDoc Scout ActiveX library instead