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// Error! Nonnested types cannot be marked private!

private class SportsCar

{}

The First Pillar: C#’s Encapsulation Services

The concept of encapsulation revolves around the notion that an object’s internal data should not

be directly accessible from an object instance. Rather, if the caller wants to alter the state of an

object, the user does so indirectly using accessor (i.e., “getter”) and mutator (i.e., “setter”) methods.

In C#, encapsulation is enforced at the syntactic level using the public, private, internal, and

protected keywords. To illustrate the need for encapsulation services, assume you have created the

following class definition:

C H A P T E R   5  

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D E F I N I N G   E N C A P S U L AT E D   C L A S S  T Y P E S

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