virtual, override and new: Method Hiding Demo

Animal animal = new Dog();      // the variable's type is Animal, the object is a Dog
Console.WriteLine(animal.Speak());   // Woof    virtual + override: the object's run-time type decides
Console.WriteLine(animal.Name());    // Animal  new only hides: the variable's compile-time type decides

Dog dog = new Dog();
Console.WriteLine(dog.Speak());      // Woof
Console.WriteLine(dog.Name());       // Dog

public class Animal
{
    public virtual string Speak() => "...";
    public string Name() => "Animal";
}

public class Dog : Animal
{
    public override string Speak() => "Woof";
    public new string Name() => "Dog";     // hides Animal.Name(); remove "new" to see the compiler warning
}