Compiling an object seperately from everything else

Question

So I have this custom class right?  I took a lot of time coding it myself at home.  I want to include it in a project here at work.  I just don't want to use the code at all because then my work would assume ownership of that code.  So what I want to do is compile my class into a .dll or something like that for use within the app I'm working on.

Which brings up 2 questions...

1. How can I compilie my class into a .dll file (or something like it)?
2. How do I then use that object in my application?\

Thanks...