Freely convert between List and IEnumerable

Question

How can I convert a List to an IEnumerable and then back again?

I want to do this in order to run a series

Answer 1

A List is already an IEnumerable, so you can run LINQ statements directly on your List variable.

If you don't see the LINQ extension methods like OrderBy() I'm guessing it's because you don't have a using System.Linq directive in your source file.

You do need to convert the LINQ expression result back to a List explicitly, though:

List list = ...
list = list.OrderBy(customer => customer.Name).ToList()