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The virtual and override Keywords

Polymorphism provides a way for a subclass to define its own version of a method defined by its

base class, using the process termed 

method overriding. To retrofit your current design, you need to

understand the meaning of the virtual and override keywords. If a base class wishes to define a

method that 

may be (but does not have to be) overridden by a subclass, it must mark the method

with the virtual keyword:

partial class Employee

{

// This method can now be 'overridden' by a derived class.

public virtual void GiveBonus(float amount)

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---

{

currPay += amount;

}

...

}