Got this from Scott Guthrie's blog:

Now one annoying gotcha:


There is one gotcha to be aware of, though, that can sometimes cause intellisense for the web.config file to stop working in the IDE.  This happens when a default namespace is added to the root <configuration> element.  For example, like so:


            <configuration xmlns="">


This doesn’t cause any runtime problems – but it does stop intellisense completion happening for the built-in .NET XML elements in the web.config file. 


The bad news is that the built-in web admin tool (launched via the WebSite->ASP.NET Configuration menu item in VS 2005 and Visual Web Developer) always adds this xmlns namespace when it launches – so if you use this tool to manage users/roles you’ll end up having it added to your web.config file for you.


How to fix this gotcha:


To get intellisense back when you are editing the web.config file in the IDE, just delete the xmlns reference and have the root configuration element look like so:




Everything will then work fine again.

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