I hate to nitpick, but this isn't comparable to the author's code. You're including empty descriptions and your output string will begin with a newline. These seem like small details, but they make a big difference in the conciseness with which you can write the statement.
Yeah, I figured. I just didn't want others coming away with the impression that C# is more concise than Haskell or Python. I mean, I love lambdas as much as the next C# programmer, but there is still a fair bit of clunky syntax to deal with when using C#'s great new features.
