C#: How to convert a list of objects to a list of a single property of that object?

Question

Say I have:

IList people = new List();

And the person object has properties like FirstName, LastName, and Gende

Answer 1

IList firstNames = (from person in people select person.FirstName).ToList();

Or

IList firstNames = people.Select(person => person.FirstName).ToList();