You mean that you get errors when trying to request pages in the browser, saying that you canβt find such things?
In this case, make sure that in your web.config in the block <system.web>you have something like:
<pages>
<controls>
<add tagPrefix="asp" namespace="System.Web.UI"
assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add tagPrefix="asp" namespace="System.Web.UI.WebControls"
assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</controls>
</pages>
This is very similar to the fact that another provider pushed these settings further into the .config stack (say, in the framework web.config, as was done in ASP.NET 4)
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