How do I test my .NET applications and how to I implement a tests suites?

I am programming a MUD game in .NET for fun in my spare time.

I would like to know the efficient way to test my application to see if there are "unused" objects remaining when I thought they were destroyed successfully when running the game for a few hours. Any tips?

Also, I consider myself of intermediate level in .NET (more specifically VB.NET), and I would like to know if there 开发者_运维百科is an easy way to implement a "Tests Suites" solution for an established program? Is that plugin/library/what free?

I am using VB.NET 2008 Express.

Thank you!

NUnit is a free automated unit test framework for .NET.