tI've added a class to my project to create my own database provider which is
essentially identical to the SqlDatabase provider but I need to get the
connection string from a COM+ component rather than the config file.

I tried to add the database type to my config file with the enterprise
library configuration tool, but I can't select my assembly for the TypeName.
When I click Load an Assembly and select my assembly, I get the following:
There were no types found in the assembly 'moo' that implement or inherit
from the base type 'Microsoft.Practices.EnterpriseLibrary.Data.Database'.

Note that my database provider is part of the windows app that is using it
(I know it shouldn't be but for the time being, it is). If I move the class
into its own project, I can load it just fine.

I had similar problems with the RoleProvider and RuleProviders. I had a
separate project with a RoleProvider that I could configure just fine. But
when I added a RuleProvider class to the project, the configuration tool gave
a similar error when I tried to select it as the TypeName.

I'm working entirely in VB.NET.