Note that this is only possible if your printer is duplex capable.
Here is the info on setting duplex printing using the
PrinterSettings
class
http://msdn.microsoft.com/en-us/library/system.drawing.printing.printersettings.duplex.aspx[
^]
Note that PrinterSettings are also available when using a dialog -
PrintDialog.PrinterSettings
You may hit problems getting network printers to actually have duplex set - if you do then google for "crystal reports print duplex" - there are several links with more info.