I have added

<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit.HTMLEditor" tagprefix="cc1" %>

to my aspx page and also my web.config does contain

  <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" />
    <add tagPrefix="cc1" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
  </controls>

still when I hover to below tag

<cc1:HtmlEditorExtender runat="server" Id="Editor1"></cc1:HtmlEditorExtender>

I can see this message in VS13.

Element 'HtmlEditorExtender' is not a known element. This can occur if there is a compilation error in the Web site, or the config file is missing.

And When I run the Application I get

Parser Error Message: Unknown server tag 'cc1:HtmlEditorExtender'.

target framework is 4.0 and I have also tried to replace

<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit.HTMLEditor" tagprefix="cc1" %>

with

<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="cc1" %>

And also tried with both, nothing worked.

except this, other AjaxToolKit controls are not making any issues.

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