I have a dll written by VB6 and I've use "tlbimp" command to produce an
interop assembly.

I now try to use reflexion to create an object from VB6 DLL to .NET
environment and cast it back (eg. ClassA)

Actually, it's a portion of an ASP.NET application. The DLLs were places
under "\bin" folder. I've tried running it on 2 machines both are XP
Professional IIS installed with .NET Framwwork 2.0. However, I found there
is a casting error on 1 of machine and other one works fine.

Object _com_obj = Activator.CreateInstance(t); //where t is the type get
from Assembly Object
MethodInfo mInfo = t.GetMethod("get_GenObject");
object[] param = new object[]{1,2,3,4,5};
Object _obj = mInfo.Invoke(_com_obj, param); //both machines can get object
reference, the object type is "System.__ComObject"

ClassA _oClassA = _obj as ClassA; //<---Casting is invalid on 1 machine

How to fix the casting problem? Any Missing Library required?
Is there any possible ways to find the actual type of _obj instead of
"System.__ComObject"?

Best Regards,
RC