I wasn't really sure where to post this...

I'm working with the AppDomain class, and I'm trying to get this sample VB code (http://msdn.microsoft.com/en-us/library/system.appdomain(VS.80).aspx ) to work but I'm getting the error in the subject line.  Also when I search for MarshalByRefType in Object Browser I get no results.  The article says the reference namespace is System.  Is this a type o, or did the name of the class change?

Thanks, Alex

Thanks, but System is always referenced automatically. 

There is no MarshalByRefType in System.  (And I'm guessing you've already got a reference to System in your project)

Anyway, If you're talking about the MSDN sample code for AppDomain, the "MarshalByRefType" is defined at the bottom of the code snippet.  Not obvious at first, I know!  Plus, it sounds like something you'd find in some .NET class, but it isnt.  In your code you'd replace it with the class of yours that you want to load and unload.  just change your class to inherit from MarshalByRefObject, then you can use the code.