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Abstract Factory Design Pattern

Abstract Factory : return families of related or dependent objects without specifying their concrete classes. AbstractFactory- IVehicle ConcreteFactory - Maruti, Honda AbstractProduct- IDiesel, IPetrol Product- DezirePetrol, ZenDiesel, AmazeDiesel, CityPetrol Client- This is a class which uses AbstractFactory and AbstractProduct interfaces to create a family of related objects Implementation is pretty much straight forward: Since now you have good understanding of Factory, there is nothing much to explain. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace AbstractFactory {     class Program     {         static void Main(string[] args)         {             IVehicle marutiVehicle = new Maruti();             CarClient marutiClient = new CarClient(marutiVehicle); ...
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Database Factory Design Pattern C#

Many developers has confusion on how to write database code in application. I will discuss several approaches here and try to provide explanation on each approach. Approach 1 : Easiest approach which is very straight forward which will work absolutely fine. The issues we will get to manage the project in terms of software principles. Like if you going to change Database provider, you would need to change using statements and other issue like mixing Database code with business logic etc. I will not go in detail here, I am assuming you already have an understanding of design principles. I am just exploring different approaches to achieve the database connectivity. using System.Collections.Generic; using System.Data.SqlClient; namespace DatabaseFactory {     class Program     {         static void Main(string[] args)         {             var employees = SomeDabOperation();   ...
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Dependency Injection and Inversion Of Control C# - Par 2 (Implementation)

Before going through this post, I suggest you to go through my previous post on basic concepts in Dependency injection and Inversion of control. Demo on product. This demo is based on a traditional implementation approach: We have a Product class and it has a method which takes the discount and based on some business logic it applies the discount on the product. Product service will interact with database using ProductRepository. If you will notice ProductService has dependency on 2 concrete classes i.e. Discount and ProductRepository new Discount(); new ProductRepository(); We can hence say that ProductService is tightly coupled because of these 2 dependencies. We may require to use different discount based on several factors such as Product type, Some Festival or any other factor. Based on different discounts we may need to change ProductService class also in future you may change the database from SQL to Oracle, Again it may require ProductService changes which is viol...
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