If you need to do asynchronous work, this is for you ...

I read a good article by Mike Peretz on the codeproject about delegates and asynchronous method invocation. It's a good thing to know, especially if you have work that takes a while to complete, have a UI that needs to remain fresh while doing some heavy work (although you should probably be using an MVP pattern - which takes care of this - if your app has a front end and complex business logic), etc.

You can read the article here: http://www.codeproject.com/KB/cs/AsyncMethodInvocation.aspx