What will be the output of the following code?

What will be the output of the following code?

class A {
    public virtual void Show() { Console.WriteLine("A Show"); }
}
class B : A {
    public override void Show() {
        base.Show();
        Console.WriteLine("B Show");
    }
}
class Program {
    static void Main() {
        B obj = new B();
        obj.Show();
    }
}