Hi Guillaume,
Thank you very much for using syncfusion products.
Yes, Page breaks are supported in XlsIO. The following code snippet will help you to add page breaks to the work sheet.
Code Snippet(C#):
worksheet.HPageBreaks.Add(worksheet.Range["A5"]);
worksheet.VPageBreaks.Add(worksheet.Range["B5"]);
I have also attached the sample tested at our side with this update. Please try this at your side and let us know if this helps you.
By default, page breaks are not shown in the Normal view. However, you can view them by inserting new page breaks or in page break preview. I have placed the documentation link for the same. Please go through the documentation link for further reference.
Documentation Link:
http://help.syncfusion.com/ug_92/Reporting/XlsIO/ASP.NET/default.htm?turl=Documents%2Fbreaks.htmPlease let us know if you have any clarifications.
Thanks,
Jawahar.
Sample_ab662587.zip