Visual Studio 2015 ASP.NET App Authentication

In VS2015 create new webform project, then a requester ask kind of Authentication and Application Type

Add a Foder LoggedInContent
add there a Web Config like:
<?xml version="1.0"?>
<configuration>
    <system.web>
        <authorization>
            <deny users="?"/>
        </authorization>
    </system.web>
</configuration>

to protect all files in this folder - only authenticated users can access them

add Master Page Forms too the folder

add links from Default Page (available for everyone) to above added MasterPageSitesin LogedInContent