Pulling all users info within a site collection from Provider Hosted App

Hi,

How can I pull the information (identity, name, email etc.) of all users within the site collection where the Provider Hosted App is hosted? I want to use autocomplete feature in a text box to select any user from the site collection.

My application is built on Asp.Net MVC 5 Razor with App Only Policy. The app has full control right to the site collection.

Thanks in advance.