Oops Basics
Class :

A user-defined data structure that groups properties and methods. Class doesn’t occupies memory.

Object :


Object is a Building and the class is a blueprint. Instance of Class is called object. 
An object is created in memory using keyword “new”.

Property :

Attribute of object is called properties. Eg1:- A car has color as property

Encapsulation :
Encapsulation is a process of binding the data members and member functions into a single unit.

Abstraction :

Abstraction is a process of and displaying the essential features and hiding the implementation details.

Inheritance :

Reusability of Base class members in Derived Class is called Inheritance.

Polymorphism :

When a message can be processed in different ways is called polymorphism. Polymorphism means many forms.

Polymorphism is of two types: 

-          Compile time polymorphism (Early Binding)/Overloading
-          Runtime polymorphism (LateBinding)/Overriding
-           
Operator Overloading :

using System; // A three-dimensional coordinate class. 
class ThreeD { 
  int x, y, z; // 3-D coordinates   
  public ThreeD() { x = y = z = 0; } 
  public ThreeD(int i, int j, int k) { x = i; y = j; z = k; } 
  public static ThreeD operator +(ThreeD op1, ThreeD op2)   // Overload binary +. 
  { 
    ThreeD result = new ThreeD(); 
    /* This adds together the coordinates of the two points and returns the result. */ 
    result.x = op1.x + op2.x; // These are integer additions 
    result.y = op1.y + op2.y; // and the + retains its original 
    result.z = op1.z + op2.z; // meaning relative to them. 
    return result; 
  }   // Show X, Y, Z coordinates. 
  public void show() 
  { 
    Console.WriteLine(x + ", " + y + ", " + z); 
  } 
} 

public class ThreeDDemo { 
  public static void Main() { 
    ThreeD a = new ThreeD(1, 2, 3);  ThreeD b = new ThreeD(10, 10, 10);  ThreeD c = new ThreeD(); 
    c = a + b;    c.show();     c = a + b + c;      c.show();    } 
}
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