ASP.Net SpreadProcessing

I want to set the paper type and ScaleFactor of worksheet but the code below for papertype and scalefactor does not compile.  I would like some help with this.

WorksheetPageSetup pageSetup = wb.ActiveWorksheet.WorksheetPageSetup;

pageSetup.Margins = new PageMargins(25.00, 25.00, 25.00, 25.00);

pageSetup.PaperType = PaperType.Letter;

pageSetup.ScaleFactor = new Size(0.9, 0.9);