ASP.NET MVC: how to extend the Controller class?

Question

ASP.NET

Good afternoon. Everything happens to me as follows:
The site is divided into 2 areas, public and admin.
I'm just starting with C#, and before that I worked in PHP and, of course, I'm still confused in many types and so on, so don't scold me much.
I would like to be able to extend the Controller class, from which all other controllers are inherited. It would be desirable for each controller to already have a ready-made property - connection to the database.
And in the admin area there would also be a constructor for checking authorization, otherwise it’s not comme il faut for each controller to write an authorization check and stuff data into the properties ...
Thank you in advance.

Answer 1

[Authorize]
public class FirstController : Controller
{
// TODO
}
public class SecondController : FirstController
{
public ActionResult Index()
{
return View();
}
}
When accessing /Second/Index redirects to the LogOn page.

Answer 2

why not read books? they describe some of the approaches in sufficient detail.
smarly.net/pro-asp-net-mvc-4
smarly.net/asp-net-mvc-4-in-action