I am using Ajax Controls and when I run my site getting following error: Unknown server tag 'asp:ScriptManager'. Unknown server tag 'asp:UpdatePanel'. Unknown server tag 'asp:UpdatePanel'. When I searched on google about this error, most of the article saying to use the code given below: -------------------------------- <system.web> <pages>       <controls>         <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />       </controls> </pages> ::::::::::::::: </system.web> ------------------------------- After using above cod ...

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