//This creates three new PdfDocument based on the source
//document. The first PdfDocument contains page 0 to 1,
//the second 2 to 3, the third from page 4 to the end.
//Note all page numbers are zero based.
PdfDocument[] docs = doc.Split(2, 4);

'This creates three new PdfDocument based on the source
'document. The first PdfDocument contains page 0 to 1,
'the second 2 to 3, the third from page 4 to the end.
'Note all page numbers are zero based.
Dim docs As PdfDocument() = doc.Split(2, 4)