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Oop's Concept

.Net is purely object oriented Language because it strongly support four major pillars  object oriented language.

  four Major Pillars are : -

     1) Abstraction.
     2) Encapsulation
     3) Inheritance
     4) Polymorphism

.Net  also support three minor pillars : -

    1) Strongly Type Cast
    2) Persistent
    3) Concurrency


*** ABSTRACTION ***

      In simple words  “Abstraction captures only those details about an object that are relevant to the current perspective.”

 In object-oriented programming theory, abstraction involves the facility to define objects that represent abstract “actors” that can perform work, report on and change their state, and “communicate” with other objects in the system. Abstraction is a concept which hide complexity.
*** ENCAPSULATION ***

    Encapsulation is the ability to package data, related behavior in an object bundle and control/restrict access to them (both data and function) from other objects. It is all about packaging related stuff together and hide them from external elements .

        We can see that keywords encapsulation and data hiding are used synonymously everywhere. It should not be misunderstood that encapsulation is all about data hiding only. When we say encapsulation, emphasis should be on grouping or packaging or bundling related data and behavior together.

*** INHERITANCE ***
Inheritance can be defined as the process where one object acquires the properties of another. With the use of inheritance the information is made manageable in a hierarchical order
        Different kinds of objects often have a certain amount in common with each other. Mountain bikes, road bikes, and tandem bikes, for example, all share the characteristics of bicycles (current speed, current pedal cadence, current gear). Yet each also defines additional features that make them different: tandem bicycles have two seats and two sets of handlebars; road bikes have drop handlebars; some mountain bikes have an additional chain ring, giving them a lower gear ratio.

*** Poly-Morphism ****
Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is used to refer to a child class object.
 By using poly-morphism we can implement Method-overLoading and Method-overRiding

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