RtfPdfDocumentExtensionsAddRtfAsync Method
Asynchronously renders an RTF document in the PDF document: the content starts at the position given by the
element in the current page and continues on as many new pages as it needs, inside the margins of the PDF
document. The content keeps its formatting, headings, links and images, and its headings can join the outline of the PDF document. The elements added after this call go to the last page of the content, below
LastPageRectangle