Hi Marcus,
Thank you very much for your interest in Syncfusion Products.
XlsIO provides support for inserting or removing horizontal and vertical page breaks in a worksheet by using the IHPagebreak and IVPagebreak interfaces. We have attached the online sample link which will demonstrate the insertion of page breaks in a worksheet. The documentation link for knowing more about the page breaks has also been attached below. Could you please navigate to the attached links and let us know if these help you?
Online Sample Link:
http://asp.syncfusion.com/sfaspnetsamplebrowser/9.1.0.20/Web/XlsIO.Web/Samples/4.0/Document%20Settings/DocumentProperties/cs/DocumentProperties.aspx?args=7Online Documentation Link:
http://help.syncfusion.com/ug_91/Reporting/XlsIO/Windows%20Forms/default.htm?turl=Documents%2Fbreaks.htmPlease let us know if you need any further assistance.
Thanks,
Pauline Bosco