Visual Studio :: Element 'content' Is Not A Known Element?

Nov 3, 2010

Element 'content' is not a known element. this can occur if there is a compilation error in the website, or the web.config file is missing.

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Content --- showed a green wavy line , and on hover displayed the above error.

Now I am having certain problems.

1. Visual Studio 2010 hangs when I try to use ToolBox.

2. Intellisense for controls is not working.

I have tried replacing web.config file (frm backup) , tried to debug - it doesnt show anything.

All other websites are working alright. Have problem with only one of the websites.

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