Getting myself in a sticky mess here.

Trying to create an application class as advised by various thread members.

Just tried a simple custom class with a couple of methods and properties for test purposes.

First, it protests that it can't find the class - diespite the fact that I've created it in my main class library.

Second, it now protests that that library is now invalid. And even when I restore a backup it insists the library is invalid. I've tried packing it, to no avail.

Can someone give me the idiot guide to what I need to to do
a) to create the application class and render it visible to my app and

b) how to fix the allegedly invalid class library

Mucho Gracias

Harry