נתון פרויקט שהוגדרו בו שלוש מחלקות Employee, Manager, Intern ומחלקה Driver, כך:

public class Employee {
    private int seniority; // ותק
    public Employee(int seniority) {
        this.seniority = seniority;
    }
    public int GetSeniority() {
        return this.seniority;
    }
    public virtual bool Check(Employee e) {
        Console.WriteLine("EmpCheck");
        return this.seniority > e.seniority;
    }
}
public class Manager : Employee {
    public Manager(int seniority): base(seniority) {
    }
    public bool Check(Manager m) {
        Console.WriteLine("MgrCheck");
        return this.GetSeniority() == m.GetSeniority();
    }
}
public class Intern : Employee {
    private int mentorId;
    public Intern(int seniority, int mentorId): base(seniority){
        this.mentorId = mentorId;
    }
    public override bool Check(Employee e) {
        Console.WriteLine("IntCheck");
        if (!(e is Intern)) {
            return true;
        }
        Intern other = (Intern) e;
        return this.mentorId == other.mentorId;
    }
}
public class Driver
{
    public static void Main(string[] args)
    {
        Employee e1 = new Manager(15);
        Manager m1 = new Manager(15);
        Employee e2 = new Employee(10);
        Employee i1 = new Intern(2, 800);
        Intern i2 = new Intern(2, 900);
        Intern i3 = new Intern(5, 800);
        (1) Console.WriteLine(e1.Check(m1));
        (2) Console.WriteLine(m1.Check(e1));
        (3) Console.WriteLine(m1.Check(m1));
        (4) Console.WriteLine(i1.Check(e2));
        (5) Console.WriteLine(i1.Check(i2));
        (6) Console.WriteLine(i1.Check(i3));
        (7) Console.WriteLine(e2.Check(i1));
    }
}