NGWS SDK Documentation  

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Virtual Methods

An object type can declare any of its methods as virtual. Unlike other methods, each exact type that implements the type may provide its own implementation of a virtual method. A virtual method may be invoked through the ordinary method call mechanism that uses the static type, method name, and types of parameters to choose an implementation, in which case the this pointer may be null. In addition, however, a virtual method can be invoked by a special mechanism (a virtual call) that chooses the implementation based on the dynamically detected type of the instance used to make the virtual call rather than the type statically known at compile time. Virtual methods may be marked final (see Method Inheritance).