Keyword behavior in C#

The 'new' keyword doesn't actually replace a base class member which has the same name  - it just hides it.

In the case of a virtual method or property, you can use the 'override' keyword to provide a different implementation of it in the derived class. Unlike 'new', 'override' is polymorphic i.e. if a base class variable refers to a derived class object, then the latter's implementation is called.