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Classes' data members in C#

Def: Data members are those members that contain the data for the class — fields, constants, and events. Data members can be static. A class member is always an instance member unless it is explicitly declared as static.

Desc: Fields are any variables associated with the class. You have already seen fields in use in the PhoneCustomerclass in the previous example.After you have instantiated a PhoneCustomer object, you can then access these fields using the Object.FieldName syntax, as shown in this example:

PhoneCustomer Customer1 = new PhoneCustomer();

Customer1.FirstName = "Simon";

Constants can be associated with classes in the same way as variables. You declare a constant using the const keyword. If it is declared as public, then it will be accessible from outside the class.

class PhoneCustomer

{

public const string DayOfSendingBill = "Monday";

public int CustomerID;

public string FirstName;

public string LastName;

}

Events are class members that allow an object to notify a caller whenever something noteworthy happens, such as a field or property of the class changing, or some form of user interaction occurring. The client can have code, known as an event handler, which reacts to the event.

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