One way of adding page numbering to a PDF document is with the following method. 

private Infragistics.Documents.Report.Section.ISection AddTheMainSection(
Infragistics.Documents.Report.Report report, bool continueWithPageNumbering)
{

   Infragistics.Documents.Report.Section.ISection section = report.AddSection();
   // Configure Section Properties.
   section.PageSize = Infragistics.Documents.Report.PageSizes.A4;
   section.PageMargins.All = 35;
   section.PageBorders = new Infragistics.Documents.Report.Borders(Infragistics.Documents.Graphics.Pens.Black, TABLE_CELL_PADDING);
   section.PagePaddings = new Infragistics.Documents.Report.Paddings(TABLE_CELL_PADDING);
   // Page Numbering.
   section.PageNumbering = new Infragistics.Documents.Report.Section.PageNumbering();
   section.PageNumbering.Style = smallerBlueStyle;
   section.PageNumbering.Template = "Page [Page #] of [TotalPages]";
   section.PageNumbering.Continue = continueWithPageNumbering;
   section.PageNumbering.SkipFirst = false;
   section.PageNumbering.Alignment = Infragistics.Documents.Report.PageNumberAlignment.Right;
   section.PageNumbering.OffsetX = -15;
   return section;

     } // end helper AddTheMainSection()

http://help.infragistics.com/Help/NetAdvantage/NET/2008.1/CLR2.0/html/DocumentEngine_Add_Page_Numbering.html

Sorry we removed that volume that link was made too.  You can use the link here.