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Home/ Questions/Q 6806533
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Editorial Team
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Editorial Team
Asked: May 26, 20262026-05-26T19:43:21+00:00 2026-05-26T19:43:21+00:00

I have this in my Register <%@ Register Assembly=AjaxControlToolkit Namespace=AjaxControlToolkit TagPrefix=asp %> But when

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I have this in my Register

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

But when I drop and drag a scriptmanager into VS2010 i receieve the error ajax unknown server tag asp scriptmanager

<asp:ScriptManager ID="ScriptManager1" runat="server" />

changed it to

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>

Still produces the error.

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  1. Editorial Team
    Editorial Team
    2026-05-26T19:43:22+00:00Added an answer on May 26, 2026 at 7:43 pm

    The tagprefix in your @register and the tag in in front of the scriptmanager must match. Also I think you better use the ToolkitScriptManager that comes with the toolkit http://blog.turlov.com/2008/05/scriptmanager-vs-toolkitscriptmanager.html:

    In my case it is cc1:

    <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
    

    and in your <body>

    <cc1:ToolkitScriptManager ID="TKSM" EnablePageMethods="true" EnableCdn="true" ScriptMode="Release" runat="server">
    </cc1:ToolkitScriptManager>
    
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