נתונות שתי המחלקות הבאות:

public class A {
    public static int countA = 0;
    private string st;
    public A() { this.st = "aaa"; countA++;}
    public A(string st) { this.st = st; countA++;}
    public override string ToString() { return this.st; }
    public virtual bool Same (Object obj) {
        if ((obj is A) && (((A)obj).st.Equals(this.st)))
            return true;
        return false;
    }
}
//end of class A

public class B : A {
    public static int countB = 0;
    private int num;
    public B(): base() {
        this.num = 1;
        countB++;
    }
    public B(int num): base() {
        this.num = num;
        countB++;
    }
    public B(int num, string st): base(st) {
        this.num = Math.Abs(num);
        countB++;
    }
    public override string ToString() {
        string s = this.num +"/";
        for(int i = 0; i< this.num; i++)
            s+= base.ToString();
        return s;
    }
    public override bool Same (Object obj) {
        if ((obj is B) && (((B)obj).num == this.num))
            return true;
        return false;
    }
} //end of class B