asp.net c#.net jquery / javascript how to enable or disable a requiredfieldvalidator using a checkbox -

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i having issue trying enable or disable requiredfieldvalidator using checkbox. obviously, when checkbox checked want enabled , unchecked disabled. when checkbox checked opens fileupload want register if there not file chosen. here of code.

html:

            <tr>                 <td>                     <asp:checkbox id="chkexeclaf" text="executed laf" runat="server" oncheckedchanged="chkexeclaf_checkedchanged" />                 </td>                 <td id="tblexeclaf">                     <asp:fileupload id="fileupload1" runat="server" cssclass="fileupload1" />                     <asp:requiredfieldvalidator id="rfvexeclaf" controltovalidate="fileupload1" errormessage="*required" forecolor="red" runat="server" />                 </td>                 <td>                     <asp:checkbox id="chkdatedleaseabstract" text="dated lease abstract" runat="server" />                 </td>                 <td>                     <asp:fileupload id="fileupload2" runat="server" cssclass="fileupload2" />                 </td>             </tr>

code behind:

    protected void chkexeclaf_checkedchanged(object sender, eventargs e)     {         if (fileupload1.hasfile)         {             rfvexeclaf.enabled = false;         }         else         {             rfvexeclaf.enabled = true;         }     }

jquery:

 <script type="text/javascript">     $(function () {         $('.fileupload1').attr('disabled', true);         $('.rfvexeclaf').attr('disabled', true);         $('.rfvexeclaf').hide();         $('.fileupload1').hide();         $('#<%=chkexeclaf.clientid %>').click(function () {              if ($(this).is(':checked')) {                 $('.fileupload1').removeattr('disabled');                 $('.rfvexeclaf').removeattr('disabled');                 $('.rfvexeclaf').show();                 $('.fileupload1').show();             } else {                 $('.fileupload1').attr('disabled', true);                 $('.rfvexeclaf').attr('disabled', true);                 $('.rfvexeclaf').hide();                 $('.fileupload1').hide();             }         });     }); </script>

have tried adding breakpoint codebehind , see if breakpoint hit on checkedchanged?

if doesn't hit may want add autopostback = 'true' chkexeclaf


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