ASP.NET web application connect with dynamics CRM

Hi,

i am creating asp.net web application to show CRM Online opportunity, pls guide how can i get connected with Dynamics CRM Online through my custom web application.

i got following link  but getting unable to find connection string message.

https://community.dynamics.com/crm/b/scaleablesolutionsblog/archive/2016/01/04/connecting-asp-net-mvc-application-to-dynamic-crm

Pls guide.

Thx