Open Source ASP.NET Maintenance Mode Module - AM3

Web developers at times need to put their web applications in an offline mode so as to prevent visitors from accessing the site while they are updating it. The classic way to do this would be to upload an app_offline.html file to the root of the web application. The limitation of this technique is that even the developer cannot visit the site! A developer might need to ensure if everything is working fine and at the same time prevent other users from accessing the web site.