Annotation Rect Property. The rectangle which defines the position and area of the annotation on the page. ABCpdf .NET PDF Library. From ABCpdf .net previous page next page Rect Property Type Default Read Only Description [C#] XRect [Visual Basic] XRect n/a No The rectangle which defines the position and area of the annotation on the page. may throw NullReferenceException() Notes The XRect which defines the position and area of the annotation on the page. This rectangle is encoded in PDF coordinates rather than any abstracted coordinate space. This property must always have a value. Attempting to assign a null value to this property will result in a NullReferenceException being thrown. Example None. previous page start next page