IIS and ASP.Net Web Site Session Timeout

A timeout is defined as "idle". So the session is closed, when it is idle for more than 15 minutes.
But if the users continues to click, a new session is created.

What is your intention to do? What should happen?  

Bembi
If the user is on his computer
Has the web site open to any page
Walks away for 16 minutes
The site should end the session
And when they click... it redirects to Login.aspx

There is an older question addrfessing the same question with some links inside:

https://www.experts-exchange.com/questions/27041535/How-to-force-user-to-re-login-after-my-session-variable-expires-in-ASP-Net.html

<system.web>
  <authentication mode="Forms">
    <forms loginUrl="Login.aspx"
           timeout="15"
           protection="none"
           cookieless="false" />
  </authentication>
</system.web> 

Hey Bembi
I have this already...  <forms name="admin" loginUrl="login.aspx" protection="All" path="/" timeout="15"/>
What is the difference on the protection = none?

protection is the encryption of the cookie.
Default = all

Should not make a difference...(I mean according to the question)
What happens after the login, do you serve aspx files or html?
If you serve html, you may change the associating extensions (i.e htm, html) to aspnet_isapi.dll 

Bembi
It is a CRM System each aspx page using vb code behind to data from MS SQL Server

Dustin Saunders 
Seems to me with your code
I could place that in the BootStrap.Master Page
And on time limit
Redirect to a page...
That kills the sessions
And then reloads the Login page?

@Larry Brister
That's the idea, you can use window.location.replace instead to bump to another route.