'Declaration

Public ReadOnly Property IsBitmapDataEmpty As Boolean

public bool IsBitmapDataEmpty { get; }

public: __property bool get_IsBitmapDataEmpty();

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

true - image has a bitmap as a source but memory for bitmap is not allocated yet; false - image has a file or stream as a source or image has bitmap as a source and memory for bitmap is allocated.