Fields Clear Function. Removes all items from the collection. ABCpdf .NET PDF Library. From ABCpdf .net previous page next page Clear Function Removes all items from the collection. Syntax [C#] void Clear() [Visual Basic] Sub Clear() may throw NotSupportedException() Params Name Description none Notes Removes all items from the collection. All Fields collections are read only so calling this function will generate a NotSupportedException. Example None. previous page start next page