How to glue 2 IEnumerable into 1?

Question

C++ / C#

There are 2 IEnumerable. How to merge them into 1 sequence, but only, not through the Concat method, so that the output is something like ? IEnumerable<Tuple<int, int>>

Answer 1

var ee = enum1.Zip(enum2, (e1, e2) => new Tuple<int, int>(e1, e2));