If, when accessing your ASP .NET application, the message "AJAX: Unknown server tag 'asp: ScriptManager'" appears, please enter the following sequence in the web.config file: 

<pages>
<controls>
<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</controls>
</pages>
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