In reference to this thread: Aspose.cells.workbook does not implement System.IDisposable
Thanks for your posting and using Aspose.Cells.
Workbook is a pure .NET object, it does not use any unmanaged resources, so you do not need to dispose it of. However, we implemented IDisposable on some user request, because he needs us to implement this method for his own application logic. So this is just an empty method and does not have any real thing inside it.
Please check this thread for your reference.
( Aspose.cells.workbook does not implement System.IDisposable )