Returns an int representing the number of pages this document had when it was last opened in Word.
int
public int NumPagesOnLastOpen{ get; }
Public ReadOnly Property NumPagesOnLastOpen() As Integer
MS Word equivalent: File menu > Properties > Statistics tab > Statistics listbox > Pages:
int numPages = oDocument.NumPagesOnLastOpen;
Dim numPages As Integer = oDocument.NumPagesOnLastOpen