'Declaration

Public ReadOnly Property IsPageCountExact As Boolean

public bool IsPageCountExact { get; }

public: __property bool get_IsPageCountExact();

public:
property bool IsPageCountExact {
   bool get();
}

True - the visual editor finished the page layout and the PageCount property has its real value;
false - the visual editor does the page layout and the PageCount property can be changed during the page layout.