FileSpecification Volatile Property. Whether the file changes frequently. ABCpdf .NET PDF Library. From ABCpdf .net previous page next page Volatile Property Type Default Value Read Only Description [C#] bool [Visual Basic] Boolean false No Whether the file changes frequently. Notes This property indicates whether the file changes frequently and needs to be reloaded each time it is used, or if it is not and may be cached. Example None. previous page start next page