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How to make the ASP.Net Application Offline when we are Upgrading?
When we are upgrading our websites we can make the application offline. ASP.Net 2.0 introduced a new way of making the application offline when we do some changes or upgradation to our site in production.
The trick is, just include a HTML file called App_Offline.htm in the root directory and include some messages on the page. Anyone trying to access the site will be presented with the content in the App_Offline.htm file. ASP.Net will shutdown the app domain and sends back the content of this html file instead for every request.
App_Offline.htm
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Untitled Page</title>
</head>
<body>
<h3>We are Upgrading!!! Please visit us later!!!</h3>
</body>
</html>
If the above page content is not showing up on your browser, then just do the following changes in your IE. Open IE > Tools >Internet Options> Advanced > Uncheck "Show Friendly Http error messages".
Reference
Scott Guthrie
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