troubleshooting Question

This control cannot be displayed because its TagPrefix is not registered in this Web Form

Avatar of ksfok
ksfok asked on
ASP.NET
1 Comment1 Solution10176 ViewsLast Modified:
Given in web.config:
      <system.web>
            <pages>
                  <controls>
                        <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
                        <add namespace="AjaxControlToolkit" assembly="AjaxControlToolkit" tagPrefix="ajaxToolkit"/>
                  </controls>
            </pages>

Why does the following HTML in Default.aspx's design view says:"This control cannot be displayed because its TagPrefix is not registered in this Web Form":
        <ajaxToolkit:CascadingDropDown ID="CascadingDropDown1" runat="server" TargetControlID="DropDownList1"
            Category="Make"  PromptText="Please select a make"  LoadingText="[Loading makes...]"
            ServicePath="CarsService.asmx" ServiceMethod="GetDropDownContents" />
     
Thanks.
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