OOP

OOP is nothing but Object Oriented Programming. C# is an Object Oriented Programming Language.

OBJECT:

• Object is the key to realize Object oriented Programming concept.
• Software Objects are just as same as real world object i.e. both of them are having their own state and behaviour.
• Here, the objects are stores its state in fields and exposes its behavior in Methods.
• Methods operates on an objects internal state and serve as the primary mechanism for object to object communication.

• Modularity - The source code for an object can be written and maintained independently of the source code for the other object.
• Hiding the irrelevant data by interacting with the methods of object.
• Reuse of Code
• debugging and plugability- If there is any error in particular object, we can easily replace the object with other.

• Encapsulation
• Inheritance
  
• Polymorphism

• It is the programming mechanism, that an object has something like shell around it protecting the attributes or status variables are being accessed from the outside of an object.
• The method of an object only can access the attributes or status variables, can read and change the value of it.

• Inheritance is the process by which one object can acquire the properties of other object.
• It supports the concept of hierarchical classification.
• Inheritance means that the derived class inherits all attributes and methods from its super class, the class from which it is derived.

• The Polymorphism is the greek word, means many form.
• The polymorphism is the quality that allows interface to access the general class of actions.
• The object must know itself what has to be done and how, nobody cares as long as the object appears on the screen.