//Visual Basic 2010 Redefinition - Invariance, Covariance en Contravariance Static Typing en Dynamic Binding
public class Fruit {
    public virtual void MethodA() {
    }
}
public class Apple : Fruit {
    public virtual void MethodB() {
    }
}
public class GrannySmith : Apple {
    public virtual void MethodC() {
    }
}
public class JonaGold : Apple {
    public virtual void MethodD() {
    }
}
public class BaseClass {
    public virtual void Method1(Apple argument) {
    }
}
public class DerivedClass : BaseClass {
    public override void Method1(Apple argument) {
    }
    public override void Method1(Fruit argument) {
        Console.WriteLine(argument.MethodA());
    }
}
public class ExpectedContraVariance {
    public static void Main() {
        GrannySmith grannySmith1 = new GrannySmith();
        JonaGold jonaGold1 = new JonaGold();
        BaseClass object1 = new DerivedClass();
        object1.Method1(grannySmith1);
    }
}
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