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// The 'state' of the Car.

public string petName;

public int currSpeed;

}

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Figure 5-1.

Inserting a new C# class type

Notice that these member variables are declared using the public access modifier. Public

members of a class are directly accessible once an 

object of this type has been created. As you may

already know, the term “object” is used to represent an instance of a given class type created using

the new keyword.

■

Note

Field data of a class should seldom (if ever) be defined as public. To preserve the integrity of your state

data, it is a far better design to define data as private (or possibly protected) and allow controlled access to the

data via type properties (as shown later in this chapter). However, to keep this first example as simple as possible,

public data fits the bill.

After you have defined the set of member variables that represent the state of the type, the next

design step is to establish the members that model its behavior. For this example, the Car class will

define one method named SpeedUp() and another named PrintState():

class Car

{

// The 'state' of the Car.

public string petName;

public int currSpeed;