Design Pattern in C#

What is Design Pattern

Design pattern is nothing but a solution to a software design . 
Four authors written a book called  Gang of Four.

Introduction-To-Design-Pattern

Design Pattern Types

Book called Design Patterns : Elements of reusable object oriented software. Here they mentioned there are 23 design pattern divided into 3 types as below.

• Creational Pattern
• Structural pattern
• Behavioral pattern

Creational Pattern- This types of pattern describe ways to create the object .

Below are the creational patterns.

•  Abstract Factory - Creates an instance of several families of classes
•   Builder - Separates object construction from its representation
•   Factory Method - Creates an instance of several derived classes
•   Prototype - A fully initialized instance to be copied or cloned
•   Singleton - A class of which only a single instance can exist

Structural pattern- This pattern deals with the class and object composition.

•   Adapter - Match interfaces of different classes
•   Bridge - Separates an object’s interface from its     implementation
•   Composite - A tree structure of simple and composite objects.
•   Decorator - Add responsibilities to objects dynamically
•   Facade - A single class that represents an entire subsystem
•   Flyweight - A fine-grained instance used for efficient sharing
•   Proxy - An object representing another object

Behavioral Pattern- This design pattern deals with the communication between the objects. 

•   Chain of Resp. - A way of passing a request between a    chain of objects
•   Command - Encapsulate a command request as an      object
•   Interpreter - A way to include language elements in a     program
•   Iterator - Sequentially access the elements of a   collection
•   Mediator - Defines simplified communication between classes
•   Memento - Capture and restore an object's internal state
•   Observer - A way of notifying change to a number of classes
•   State - Alter an object's behavior when its state changes
•   Strategy - Encapsulates an algorithm inside a class
•   Template Method - Defer the exact steps of an algorithm to a subclass
•   Visitor - Defines a new operation to a class without change

Advantages of using Design Pattern

• Easy to maintain the code 
• Avoid mistakes as it follows Open close Principle.
• Easy to understand.
• Improve the performance of the application.
• More Secured

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