Hi,
I followed the instructions here: (http://aspnet.4guysfromrolla.com/articles/053102-1.aspx) and all works fine.
Normally you don't even need to add the Using System.Configuration on top of the page.
Maybe these brackets: [] are wrong; maybe they should be round.
Is the appSettings tag in the web.config in the right place? (like here below; between the end-configSections and the start-system.web)
</configSections>
<appSettings>
<add key="setting" value="TEST VALUE" />
</appSettings>
<system.web>
Please refer to the article!
Hope this helps.
Wim
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