C# 0 The Complete Reference

Area

 and 

Occupants

 fields, which are encapsulated by 

Building

.

Thus, it is possible for the 

Building

 class to perform this calculation on its own. Furthermore, 

by adding this calculation to 

Building

, you prevent each program that uses 

Building

 from 

having to perform this calculation manually. This prevents the unnecessary duplication of 

code. Finally, by adding a method to 

Building

 that computes the area-per-person, you are 

enhancing its object-oriented structure by encapsulating the quantities that relate directly 

to a building inside 

Building

.

To add a method to 

Building

, specify it within 

Building

’s declaration. For example, the 

following version of 

Building

 contains a method called