Design Pattern

https://dotnettutorials.net/lesson/facade-design-pattern/

We need to use the Facade Design Pattern in C# when

1. We want to provide a simple interface to a complex subsystem. Subsystems often get more complex as they evolve.
2. There are many dependencies between clients and the implementation classes

http://www.dotnettricks.com/learn/designpatterns

http://www.csharpstar.com/async-await-keyword-csharp/

http://mohammadnazmul.blogspot.com/2014/02/design-patterns-gof-design-patterns-are.html

https://hasin.me/2014/05/13/factory-design-pattern/

http://mohammadnazmul.blogspot.com/2014/02/facade-design-pattern.html

https://hasin.me/2014/05/13/factory-design-pattern/

https://hasin.me/2014/05/14/singleton-design-pattern/