how to get page numbers page x of y in pdf at dynamically using itextsharp in ASP.Net

Thanks for giving reply @Shashikant

http://www.aspsnippets.com/Articles/iTextSharp-Add-Page-numbers-to-existing-PDF-using-C-and-VBNet.aspx

by using above url my problem solved.. actually problem is my itextsharp.dll version not working with 

using (PdfStamper stamper = new PdfStamper(reader, stream))

so, i am updated my itextsharp.dll whatever you provide in example. after changing itextsharp my query worked perfectly..

using (PdfStamper stamper = new PdfStamper(reader, stream)) worked after changing itextsharp.dll..

Thanks for giving reply..