COM dll in vb.net windows service

[Sutapa]

Hi,

I am creating a vb.net windows service . In this service I am accessing a
COM dll. I created meta DLL using tlbimp. I added reference of this meta dll
in my vb.net service code.

I declare globally
Public WithEvents m_objAdmin As MyMetadata.AdministrationManager
Public WithEvents m_objRouting As MyMetadata.RoutingManager
Public m_objHipath As MyMetadata.HiPathProCenterManager
Public m_objMedia As MyMetadata.MediaManager

In my service start, I do all the login using objHipath object which are
successful and service starts successfully.

when I get Event for MyMetadata.RoutingManager, I need to access my global
objects objMedia ,objAdmin and objRouting but it throws error when i access
any of these objects.It seems they are loosing the reference to these
objects.

When I try same code in vb.net window application it works fine.

Could anybody tell me where i am going wrong and how to correct it.?

Thanks