Is the bin folder included in custom quest code (for imports)

I want to use reaplers DB in the custom quest code (build dll), if I use fully qualified class names, I still get a reference error when running the custom code, if the .dll is in the bin folder, will I have access to it?

for example, in my quest code I have this line:

        DatabaseManager.Filter.CreatureFilter killList2 = new DatabaseManager.Filter.CreatureFilter
        {
            ContinentId = (ContinentId) Usefuls.ContinentId,

            Name = "Mindless Zombie"
        };

I get the error:

The type or namespace name 'DatabaseManager' could not be found (are you missing a using directive or an assembly reference)...

How can I fix this?

Edit: It's not an error in visual studio or the IDE, it's at runtime in Wrobot