Real Time Notification for Angular 2 web app with asp.net web API back end
<p>I am working on a web application (Angular 2 and Asp.net web API) that expected to be notified the user when some task has been created by another user(An entry on the Tasks table in the Database). Notification can be something similar to Facebook notification.</p>

<p>What are the technologies can be used to achieve this real-time notification? 
I am new to real time applications so please help me to choose the right path.</p>