Assembly: TallComponents.PDF.Kit (in TallComponents.PDF.Kit.dll) Version: 18.104.22.168
PageCollection does not accept duplicate elements. Note: When a duplicate entry is found the state of the collection is undefined. (None or some entries might have been added. The status is not reverted.)
While appending existing pages to a target document, the source documents need to be open until the target document.Write is called.