1. Computer science Object-Oriented Programming

2. Overview There are several words that are important: class object instance field property method event

3. Class and object “You must define a class before you can create an object” Class is a blueprint, from which you can create objects. It defines a characteristic of an object, such as the data that the object contain and the operations that the object can perform. Object is an instance of a class. If a class is a blueprint of an object, an object is what is created from that blueprint.

4. Instance and Field “instance” – often used as an alternative to object. Field is a class member that represents a piece of data that the class needs to fulfill its design. Typically defined as private members in a class, to prevent the fields from being accessed directly from outside the class.

5. Property, method and event Property is a flexible mechanism to read write or compute the values of a field. Method comprise a code block and represents an action that object or class can perform. Event indicates something has happened to an object or class. Event provide a notification mechanism that enables observes in the application to respond to event ad perform appropriate event-handling operations.

6. About Some of the definitions are from a course 499A by Microsoft Learning. Copyright (C) Microsoft This presentation is made by Artem Los artem@artemlos.net