I'm having the following classes:

class Base
{
    public virtual void Print()
    {
        Console.WriteLine("Base");
    }
}

class Der1 : Base
{
    public new virtual void Print()
    {
        Console.WriteLine("Der1");
    }
}

class Der2 : Der1
{
    public override void Print()
    {
        Console.WriteLine("Der2");
    }
}

This is my main method:

Base b = new Der2();
Der1 d1 = new Der2();
Der2 d2 = new Der2();

b.Print();
d1.Print();
d2.Print();

The output is Base, Der2, Der2.

As far as I know, Override won't let previous method to run, even if the pointer is pointing to them. So the first line should output Der2 as well. However Base came out.

How is it possible? How the override didn't work there?