The PdfFormRequestedEventArgs type exposes the following members.
Path to the file that contains the PDF form requested.
The number of page that were requested by the client. Returns -1 if all layers were requested.
The starting page index requested.
PDF document to get the forms from. This property will be populated with the current loaded document if one was loaded to get the document info, otherwise it will be null. Setting this property will allow forms from a different document to be loaded, if desired.