Here is a quick post that may help you save few hours if you get into this problem. Symptoms — Out of blue you realize that when you try to create and open a new Web  site/Web Application project we do not see any of the Web controls in the Toolbox. It includes most of the sections in the Toolbox pane including Common controls, Data, Login, validation and in fact any of the controls which are associated with an Asp.Net web page

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Visual Studio 2005/2008 IDE: Web Controls in the Toolbox seen grayed out for Asp.Net projects ?

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