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.
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:
and in your
<body>