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Editorial Team
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Asked: 2026-05-30T09:40:43+00:00

I am trying my hands on Visual Studio 2010 (Asp.Net 4.0) for the first

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I am trying my hands on Visual Studio 2010 (Asp.Net 4.0) for the first time. I want to use Ajax controls, mainly ComboBox control.

I followed the step-by-step procedure mentioned in this link to download and install AjavControlToolkit.

I also followed this link for steps to add ComboBox to my webpage.

But no matter what I do, there is a green line under the control and I’m getting the error “Unrecognized tag prefix or device filter ‘ajax'”.

My web.config file looks like this:

         <configuration>
       <system.web>
    <pages>
        <controls>
            <add tagPrefix="ajax" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit"/>
            <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
            <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
        </controls>
    </pages>
    <compilation debug="true" targetFramework="4.0">
        <assemblies>
            <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
            <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/></assemblies></compilation>
  </system.web>
    </configuration>

The aspx page looks like this:

     <form id="form1" runat="server">
       <div>
        <asp:ScriptManager ID="sm" runat="server"></asp:ScriptManager>
        <ajax:ComboBox runat="server" AutoCompleteMode="SuggestAppend">
          <asp:ListItem>ddd</asp:ListItem>
          <asp:ListItem>fff</asp:ListItem>
          <asp:ListItem>gggg</asp:ListItem>
          <asp:ListItem>hhhhh</asp:ListItem>
        </ajax:ComboBox>    
       </div>
    </form>

I have even tried deleting the schema files from C:\Documents and Settings\xxx\Application Data\Microsoft\VisualStudio\10.0\ReflectedSchemas location.

Please help me in successfully implementing the Combobox control.
Thanks!

Edited:

As a different approach, I created a new website and installed the latest version of AjaxControlToolkit using NuGet. I rebuilt the solution. I still could not see the Ajax controls in intellisense.
Is there anything else that needs to be done to implement it? Please help!!

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1 Answer

  1. Editorial Team

    If you are using Visual Studio 2010 then I recommend downloading AJAXControlToolkit from Nuget a shown in this post (link).

    I yesterday stumbled at the same problem and what worked was changing the prefix to “ajaxToolkit” and doing same thing for script manager as Stephen Walter is showing in this post (link). Please use ToolScriptManager instead of ScriptManager. 

    <ajaxToolkit:ToolScriptManager id="id12" runat="server"/>
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