how to convert an ienumerable to a list code example

Example 1: convert ienumerable to list

using Linq;

IEnumerable<int> enumerable = Enumerable.Range(1, 300);
List<int> asList = enumerable.ToList();

Example 2: convert list to ienumerable

List<Book> list = new List<Book>();
return list.AsEnumerable();