c# - Range validator not working -


i trying put asp.net required field validator , range validator required field validator works not range. why ?

<asp:textbox id="txtcnic" runat="server" cssclass="textfield_width"></asp:textbox>                             <asp:requiredfieldvalidator id="requiredfieldvalidator2" runat="server" controltovalidate="txtcnic" errormessage="requiredfieldvalidator" forecolor="#ff3300" setfocusonerror="true" validationgroup="complaints">cnic required</asp:requiredfieldvalidator>                             <asp:rangevalidator                                 controltovalidate="txtcnic"                                 minimumvalue="14"                                 maximumvalue="16"                                 type="string"                                 validationgroup="complaints"                                 enableclientscript="false"                                 text="cnic can not longer 15 characters"                                 runat="server" /> <asp:button id="btnsave"  cssclass="btn btn-success"  runat="server" text="save"           validationgroup="complaints" clientidmode="static" onclick="btnsave_click" />

asp rangevalidator meant validate input within given range, whereas in case seems want validate input length. this, can this:

in page, replace rangevalidator customvalidator:

<asp:customvalidator runat="server" id="txtcnicvalidator"      controltovalidate="txtcnic" clientvalidationfunction="validatecnic"      errormessage="cnic must 15 characters long!" />

and add corresponding validation function in javascript:

<script type="text/javascript">   function validatecnic(sender, args) {     args.isvalid = (args.value.length == 15);   } </script>

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