Hi Thuy,
Thanks for contacting Syncfusion support.
We can achieve your requirement with the help of Syncfuison PDF portable assembly. Please refer the below link for more details about the PDF portable
http://help.syncfusion.com/ug/xamarin/index.html#!Documents/gettingstarted8.htm We have also prepared a sample based on your requirement. Please find the sample in the below location.
Sample:
ExportAsPDFNote: In Xamarin.Android, We need to set permission as Write_External_Storage.
RightClick Project -> Properties -> Android Manifest -> Required permission -> Write_External_Storage.
Please let us know if you need further assistance on this.
Thanks,
Manivannan.E