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

This will turn it to a list:

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

This will return one (the first one):

var firstname = people.select(e => e.firstname).FirstOrDefault();