How to check Ms Office Web Components version installed?

Question

Hi ! I'm using Office Microsoft Office Web Componets (OWC) objects (E.g. AxOWC10.AxSpreadsheet) in my application written in C#. Recently I found when I use Office 2003 instead of Office XP, the namespace AxOWC10 is changed to AxOWC11. Now I need to detect at run time, the version of OWC installed, and then use either AxOWC10 or AxOWC11 namespace appropriately. How can I check the version of OWC at runtime using C#.NET? Thanks in advance ! Chamara Ratnaweera