Unknown server tag 'cc1:AsyncFileUpload'.

Question

I've recently downloaded Ajax Control Toolkit to use with my ASP.NET web app. I added the AsyncFileUpload control to a web form but when I try to run the application, I get an error :

"Unknown server tag 'cc1:AsyncFileUpload'." 

I have this in the ".aspx" page :

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1"    %>

Answer 1

Dit you register the tagprefix in your .config file or in the page via e.g.

(page example):

<%@ Register TagPrefix="cc1" Namespace="YourAjaxToolkitNamespace" Assembly = "YourAjaxToolkitAssembly" %>

or (web.config example):

<system.web>
    <pages>
      <controls>
        <add assembly="Subtext.Web.Controls"
                namespace="Subtext.Web.Controls"
                tagPrefix="st" />
        <add src="~/Controls/SomeControl.ascx"
                tagName="SomeControl"
                tagPrefix="st" />
      </controls>
    </pages>
</system.web>

Answer 2

I guess you have the older vesion of Ajax Control Toolkit.