c# - ajax combobox not working -

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i trying use ajax combobox in asp.net web forms.

i have added ajax toolkit , can use other controls popupcontrolextender etc. when use combobox gives error saying combobox not known element.

i right-clicked on ajaxcontrol toolkit in toolbar--> choose items , verified combobox checked doesn't appear in toolbar

does know issue may or has faced similar problem ?

edit :

code : 

        <div>             <asp:scriptmanager runat="server" id ="scriptmanager1" />                  describe how spicy food:             <br />             <cc1:combobox id="combobox1" runat="server">                 <asp:listitem text="mild" value="0" />                 <asp:listitem text="medium" value="1" />                 <asp:listitem text="hot" value="2" />             </cc1:combobox>                  <%-- <asp:button                 id="btnsubmit"                 text="submit"                 runat="server" onclick="btnsubmit_click" />--%>           </div>

also,i have added top of page after page directive :

<%@ register assembly="ajaxcontroltoolkit" namespace="ajaxcontroltoolkit" tagprefix="cc1" %>

any idea,anyone ?


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