OOPS concept in c#

OOPS stand for Object Oriented Programming. It is a design principle for developing an application\Software. 

Everything in OOPS is related to Object.

OOPS have four main concepts: Abstractions, Encapsulation, Polymorphism and Inheritance.

OOPS(Object Oriented Programming) is programming model where programs are organized around objects and data rather than action and logic.

Class:-

A class is a construct that enables you to create your own custom types by grouping variables of other type, methods and events.

A class is a blueprint of an object. It defines the data and behavior of type. We can also called, class is a collection of Objects.

A class is the pillar or core of any modern OOPS language.

Class Syntax :-

 class Class_Name

 {

      // Fields, Methods, Properies and Events goes here

  }

The name of the class always followed by class keyword.

A class will not occupy any memory space and it only a logical representation of data. When we create an object of class that time object will hold the memories.

Every class has a constructor and destructors. A constructor is called automatically any time an instance or object of a class is created.

A class is reference type.

Types of Class:-

•    Abstract Class
•  Partial Class
•  Sealed Class
•  Static Class

     Object:-

     

•        Object is an instance of class.
•        Object is a real world entity (ex. A person or a place).
•        Object is basically a block of memory that has been allocated and configured to         according to the blueprint. A program may create many object s of same class. 
•        Objects can be stored either in a named variable or in an array or collections.
•        When we make a class as static class then we cannot create instance or object of the class.
•        When create an object using new operator, memory allocate for the class is on Heap.

  Example for Creation An object of class.

       

       Program objProgram = new Program();

     Here Program is a class  and objProgram is an object of class Program.

    

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