Add iTextSharp.dll as a reference. Download from SourceForge.net
Let try this:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using iTextSharp.text.pdf;
using iTextSharp.text.xml;
namespace GetPages_PDF
{
class Program
{
static void Main(string[] args)
{
string pdfPath = "C:\\sources\\helloworld.pdf";
PdfReader pdfReader = new PdfReader(pdfPath);
int noOfPages = pdfReader.NumberOfPages;
Console.WriteLine(noOfPages);
}
}
}