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

http://www.aspsnippets.com/Articles/How-to-generate-and-download-PDF-Report-from-database-in-ASPNet-using-iTextSharp-C-and-VBNet.aspx

http://nilthakkar.blogspot.in/2013/11/itextsharpadd-headerfooter-to-pdf.html

by using above urls i generate pdfs dynamically by using itextsharp my problem is i am not getting page numbers like page 1 of 2 in first page, page 2 of 2 in second page in pdfs. how to solve this query, please help me