IIS settings file App_Offline.htm website maintenance,

IIS settings file App_Offline.htm website maintenance,
Under the root directory of the ASP. NET 2.0 site, all requests to .aspxwill be directed to App_Offline.htm if the App_Offline.htm file exists. In addition, the address bar of the browser displays the requested. aspx URL.

In this case, we only need to copy the app_offline.htm to the root directory of the site. Note:
(1)App_Offline.htm cannot be smaller than 512 bytes.
(2) IIS cannot Stop.
Optional (3366app_offline.htm file name is case insensitive