PdfConformityOperation Messages Property. The messages for writing in the conforming PDF format. ABCpdf .NET PDF Library. From ABCpdf .net previous page next page Messages Property Type Default Read Only Description [C#]IList<string>[Visual Basic]IList(Of String) null Yes The messages for writing in the conforming PDF format. Notes This property holds the messages for writing in the conforming PDF format. They describe changes made to the document. Example None. previous page start next page