I am looking for some advise, I currently have a VB.Net application using .NET frameworks 2 written in VS 2005. One of my clients wants to know if the application works with Unicode, at the moment I have not tested this and what I am looking for is some advise on how to do this e.g.

1) Does anything need to be added to my project e.g. code to allow this functionality.
2) Is there a way that I can easily check to see if my application can work with Unicode?
3) Advise on how other people test for this?

I know it is a bit general, but as I have not done this before I am obviously trying to build my knowledge and get it right with regards to testing etc.

Thanks in advance

Simon