If you work at a company with a security-/saving-money-/hassle-employees- policy restricting your choice to VS2010 (Premium or Ultimate), see my answer to:
Running NUnit tests in Visual Studio 2010 with code coverage
There, I refer to this other answer, but also give some more details than that:
Does VS2010 Code Coverage support nUnit?
I know, copied/referring answers (esp. of others) are worth downvoting, but as I said, I give some details, which would've helped me quite a lot.