void insertPerson(object o)
 {
     int pos = people.IndexOf((Person)o);
     Person p = new Person { FirstName = "Catherine", LastName = "Connerly", Age = 50 };
     people.Insert(pos, p);
 }
 void addPerson(object o)
 {
     Person p = new Person { FirstName = "James", LastName = "Wood", Age = 11 };
     people.Add(p);
 }