Closes the PdfDocument's underlying stream, invalidates all pages, and
clears the Pages collection.
Atalasoft.PdfDoc (in Atalasoft.PdfDoc.dll) Version: 126.96.36.199.0.297 (.NET 4.5.2, x86)
When a PdfDocument has been constructed from a string representing a path,
it is necessary to call Close to ensure that the underlying stream created
by the constructor will be closed. Calling Close() will invalidate all
existing PdfPage objects that were associated with the original PdfDocument,
even if they are contained within a new PdfDocument.
When a PdfDocument has been constructed from a Stream object, the Stream
will be closed.