person_icomparable.cs

public class Person : IComparable
    {
        public string Name { get; set; }
        public int Age { get; set; }

        public int CompareTo(Object obj)
        {
            Person otherPerson = obj as Person;
            if (otherPerson == null)
            {
                throw new ArgumentNullException();
            }
            else
            {
                return Age.CompareTo(otherPerson.Age);
            }
        }
    }