Adds a PDF document from the given stream before the result of HTML to PDF conversion. If the AutoCloseExternalDocs property is true the 
            added document will be automatically closed when the final document is closed or saved. The header and footer are not applied to the PDF
            documents added by this method. If you want to enable the header and footer in the added PDF document use the AddStartDocument(Stream, Boolean, Boolean, Boolean)
Namespace: Winnovative
Assembly: wnvhtmltopdf (in wnvhtmltopdf.dll) Version: 17.0.0.0
Syntax
Parameters
- pdfStream
 - Type: System.IOStream
The stream from where to read the PDF document to be inserted before conversion result 
See Also