Observer and Observale in Reactive Extension using C# - ReactiveX

Описание: There are two key types to understand when working with Rx, and a subset of auxiliary types that will help you to learn Rx more effectively.
IObserver
IObservable


-After preparing these two core features we will prepare the method that we needed.
-Finally we will subscribe the instance of observer to observables.
-The subscription will perform that observer.
-After that subscription will terminate the observer.
-Finally the subscription will disposed