Is there idiomatic C# equivalent to C's comma operator?

Question

I\'m using some functional stuff in C# and keep getting stuck on the fact that List.Add doesn\'t return the updated list.

In general, I\'d like to call

Answer 1

I know this as Fluent.

A Fluent example of a List.Add using Extension Methods

static List MyAdd(this List list, T element)
{
    list.Add(element);
    return list;
}