[arwhatever]

Good call on the encapsulation. I've encountered the occasional public API with methods that require some type like a Tuple<int, int, string>, and got pretty peeved. And go ahead and name the argument "values" or something similar, for good measure.

[PJDK]

The new tuples do allow names, which can be a nice half way house so you can do something like

(bool success, string errormessage, foo addedItem)

as a return type. A big step up from Tuple<bool, string, foo>!