Why aren't these lines getting covered by code coverage?

Question

I'm using Visual Studio 2010's code coverage feature. I've made several unit tests to test a method, but the code coverage is telling me that three blocks are not getting completely covered. The problem is, I don't see how these blocks can be only partially covered. Notice that the return statements ARE covered, so clearly the branch has been taken. Any ideas?

Answer 1

The answer turned out to be that endDate is nullable. Even though I handle null cases at the top, the code coverage wanted to see the null situation delt with at each branch with endDate in it.