I published this problem sometime ago. Someone showed me how to use jquery instead

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Asked: May 23, 20262026-05-23T21:52:28+00:00 2026-05-23T21:52:28+00:00

I published this problem sometime ago. Someone showed me how to use jquery instead

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I published this problem sometime ago. Someone showed me how to use jquery instead of ajax controls to solve my problem so I accepted that answer. I now find that I need ajax controls once again. In particular the AsyncFileUpload control because FileUpLoad is not working for me. So here is the issue again, slightly revised.

I am trying to add Ajax controls to my VS 2010 project. I have previously gotten it to work when I used VS2008. I keep getting this exception:

 Error  1   The type 'System.Web.UI.ScriptControl' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

Here’s what I did. I downloaded the ajax 4 toolkit and added a reference to the project. I also added a reference to system.web extension to my project. When I do this these lines get added to my web.config.

<add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

I added these lines to my aspx file.

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

And

<cc1:AsyncFileUpload ID="afuMine" runat="server" />
</asp:Content>

The obvious thing to try is to add a reference to System.Web.Extensions. Unfortunately that didn’t help.

I also backed off and tried ajax 3.5, this didn’t help. I did notice that the ajax dll is 4.1 while the ‘System.Web.Extensions is 4.0. I don’t know if this matters but I cannot find ajax 4.0 or ‘System.Web.Extensions 4.1.
Thanks once again in advance.