Session Timeout Warning in ASP.NET c#

This article will cover the following topics:
...........................................................................
Show the alert message before the session timeout.
The user will have an option to extend or continue with the current session or he can log out from the site.
For this article I have used the css, timeout-.
..........................................................................
Well I simply have the necessary code and I am not explaining the code here. I am mainly focusing on the example and you can download the attachment for that.
Features
This is free and you have right to change this code.
You can use this with a master page and Ajax update panel as well.
You can customize all the messages and logs.
You can apply the styles and themes to the confirm window.
www.aspsnippet...
1) Redmi 5 (Black, 32GB) - amzn.to/2kCK3QU (Buy)

[@jamols09]

What a very nice music.

[@asafblasbergpianist]

Do you have a version like this for ASP.NET Core?

[@Srhuicho]

No works in a masterpage