Unknown server tag “ajaxToolkit:HtmlEditorExtender”

Question

I am using ajaxcontrols and in that all controls are working well But I had not found any of the control named as HtmlEditorExtender so I had just copied this tag in .html p

Answer 1

add

    <%@ Register
Assembly="AjaxControlToolkit"
Namespace="AjaxControlToolkit.HTMLEditor"
TagPrefix="HTMLEditor" %>

add folowing tag in your web.config

and in page