One of the big new features in C# 7 is support for tuples. Tuples are groups of values, and you can now return them directly from method calls. You are no longer restricted to returning a single value. Previously, you could work around this limitation in a few suboptimal ways, including creating a custom complex object to return, perhaps with a Plain Old C# Object (POCO) or Data Transfer Object (DTO), which are the same thing. You could have also passed in a reference using the ref or out keyword, which are still not great although there are improvements to the syntax.
There was System.Tuple in C# 6, but it wasn't ideal. It was a framework feature, rather than a language feature, and the items were only numbered and not named. With ...
