Pointer from derived class to base class C#

I have 100 classes that will inherit 1 base class. Derived class can have A and B property, just A or B property, or don't have them at all. I need a pointer, from derived class to base class, that will trigger every time I call A or B property from derived classes.

class D1 : Base
{
    int A { get; set; } // Point to Base A
}

class D2 : Base
{
    int A { get; set; } // Point to Base A
    int B { get; set; } // Point to Base B
}

class Base
{
    int A => ExampleA();
    int B => ExampleB();

    int ExampleA()
    {
        return 10;
    }

    int ExampleB()
    {
        return 15;
    }
}

static void Main(string[] args)
{
    D1 d1 = new D1();
    D2 d2 = new D2();

    d1.A; //return 10
    d2.A; //return 10
    d2.B; //return 15
}