Toastr JS

    https://github.com/CodeSeven/toastr
    https://github.com/kamranahmedse/jquery-toast-plugin/

    Nuget Install-Package toastr - will put js in Scripts and css in Content
    Demo
    http://codeseven.github.io/toastr/demo.html

    Similar Js git project 
    https://github.com/Srirangan/notifer.js/
    Demo
    http://www.srirangan.net/demos/notifier.js/index.html

The best of all worlds

http://kamranahmed.info/toast