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// Update the Employee class as abstract

// to prevent direct instantiation.

abstract partial class Employee

{

...

}

With this, if you now attempt to create an instance of the Employee class, you are issued a

compile-time error:

// Error! Cannot create an abstract class!

Employee X = new Employee();

At this point you have constructed a fairly interesting employee hierarchy. We will add a bit

more functionality to this application later in this chapter when examining C# casting rules. Until

then, Figure 6-8 illustrates the core design of our current types.

C H A P T E R   6  

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