// Ex 4: Use new keyword to prevent polymorphism
public void Ex4_New()
{
ParentA a = new ChildB();
a.Method02(); // calls childA.method2
ParentA b = new ChildB();
b.Method02(); // calls childA.method2
}
// Ex 3: Use virtual/override
public void Ex3_Virtual()
{
ChildA a = new ChildA("hello");
a.Method01(); // no override
a.Method02(); // override
a.Prop01 = "test";
Console.WriteLine("Prop01: {0}", a.Prop01);
ChildA b = new ChildB();
b.Method03(); // Sealed
b[0] = "Hello world";
Console.WriteLine("Indexer: {0}", b[0]);
b.OnChangeCustom += (o, e) => { Console.WriteLine("Test override"); };
}