Thanks for your inquiry. I’m afraid the requested feature is not supported in Aspsoe.Pdf at the moment. However, I’ve logged a feature request as PDFNEWNET-35297 in our issue tracking system to set PDF document DuplexMode property. We will notify you via this forum thread as soon as it gets available.
Moreover, you can set Duplex setting at the time of printing using PdfViewer class of Aspose.Pdf.Facades as following.
PdfViewer viewer = new PdfViewer();
//create PrinterSettings object and set properties
System.Drawing.Printing.PrinterSettings printerSettings = new System.Drawing.Printing.PrinterSettings();
printerSettings.PrinterName = “HP Officejet 4300 Series”;
printerSettings.Duplex = System.Drawing.Printing.Duplex.Default;
printerSettings.Copies = 2;
printerSettings.FromPage = 3;
printerSettings.ToPage = 5;
//create PageSettings object and set properties
System.Drawing.Printing.PageSettings pageSetting = new System.Drawing.Printing.PageSettings();
pageSetting.Landscape = true;
//print document using above settings
Sorry for the inconvenience faced.