ASP.NET 2.0 comes with this built-in feature to easily bring down an Web Application, make changes to it and reload the application back again.
It's as easy as uploading an App_Offline.htm file in the root of your Web Application directory and you are done. Include any "under construction" or "maintenance" messages in the App_Offline.htm file that you want to display to your end users.
Once you are done, simply delete the file and ASP.NET will reload the application and everything is back to normal. For detailed info check ScottGu's blog.
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