How to implement Authentication and Authorization in MVC?

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C#

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MVC3

How to implement Authentication and Authorization in MVC?

I have used it as-

public ActionResult Default()
{
if (Session["UserId"] == null)
{
Session.Abandon();

return RedirectToAction("Login", "Login");
}
else
{
return View();
}
}

After successfully logging, redirects on Home controller and action - Default.
Here i am check session userid value if it is null then go to Login controller and invoke login method.

I know that in mvc there is a attribute named as Authenticate but i am not aware how to use it.

Plz give me solution and code.


Thanks..
Ashish