Retrieval of items from custom collection

Question

I have a following class

public class People
{
    public int id;
    public string nameHash;
    public string name;
}

I need to create a

Answer 1

Is there a specific reason why it has to be a custom collection? Why not

List PeopleCollection = new List();

you can retrieve elements using id and nameHash and you can iterate over PeopleCollection