Fields Add Function. Add an item to the end of the collection. ABCpdf .NET PDF Library. From ABCpdf .net previous page next page Add Function Add an item to the end of the collection. Syntax [C#] int Add(Field field) [Visual Basic] Function Add(field As Field) As Integer may throw NotSupportedException() Params Name Description field The item to be added. Notes This method adds an item to the collection. All Fields collections are read only so calling this function will generate a NotSupportedException. Example None. previous page start next page