C# 0 The Complete Reference

Rectangle

 class includes 

TwoDShape

 and adds the methods 

IsSquare( )

, which 

determines if the rectangle is square, and 

Area( )

, which computes the area of a rectangle.

Member Access and Inheritance

As explained in Chapter 8, members of a class are often declared private to prevent their 

unauthorized use or tampering. Inheriting a class 

does not

 overrule the private access 

restriction. Thus, even though a derived class includes all of the members of its base class, 

it cannot access those members of the base class that are private. For example, if, as shown 

here, 

Width

 and 

Height

 are made private in 

TwoDShape

, then 

Triangle

 will not be able to 

access them:

// Access to private members is not inherited.

// This example will not compile.

using System;

// A class for two-dimensional objects.

class TwoDShape {

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