Unknown server tag "ajaxToolkit:HtmlEditorExtender"

ajaxcontroltoolkit, asp.net, c#

Solution

add `<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="Server" />`

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

add folowing tag in your web.config

<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0" />
<pages>
  <controls>
    <add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
  </controls>
</pages>

and in page

<ajaxToolkit:HtmlEditorExtender ID="replyBody_HtmlEditorExtender" runat="server" Enabled="True" OnImageUploadComplete="saveFile"  ClientIDMode="AutoID" EnableSanitization="true"  TargetControlID="replyBody">

Problem

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 page ``` <%@ Register TagPrefix="ajaxToolkit" Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit"%> <ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="Server" /> <ajaxToolkit:HtmlEditorExtender TargetControlID="txtComments" runat="server" /> <asp:TextBox ID="txtComments" runat="server"></asp:TextBox> ``` here is working fine but the problem arises on , then i downloaded Nuget.tool on reading some of the problems facing just like me but still its not working what shall I do? My Web.config file is ``` <configuration> <system.web> <compilation debug="true" targetFramework="4.0"/> <pages> <controls> <add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" /> </controls> <sanitizer defaultProvider="AntiXssSanitizerProvider"> <providers> <add name="AntiXssSanitizerProvider" type="AjaxControlToolkit.Sanitizer.HtmlAgilityPackSanitizerProvider" /> </providers> </sanitizer> </pages> </system.web> </configuration> ```

Original source