Jquery datatable bind from parameterized webservice -

everything fine json result not biding result datatable please help

json rsult:[{"ourbranchid":"8001","accountid":"90186772","productid":"ca-pkr"}]{"d":null}

<script type="text/javascript">        $(document).ready(function () {          $.ajax({              type: 'post',              url: 'accountservice.asmx/getaccountparam',              data: "{ 'account': '90186772'}",              contenttype: 'application/json; charset=utf-8',              datatype: 'json',              success: function (data) {                  var datatableinstance = $('#datatb').datatable({                        data: data,                     // data: data.d,                      columns: [                  { 'data': 'ourbranchid' },                  { 'data': 'accountid' },                  { 'data': 'productid' },                  ]                      });                                   $('#datatb tfoot th').each(function () {                        var title = $('#datatb thead th').eq($(this).index()).text();                      $(this).html('<input type="text"  placeholder="search ' + title + '"/>');                      });                    datatableinstance.api().columns().every(function () {                      var datatablecolumn = this;                      $(this.footer()).find('input').on('keyup change', function () {                            datatablecolumn.search(this.value).draw();                        });                    });                }                });          });                           </script>

<%@ page title="" language="c#" masterpagefile="~/site.master" autoeventwireup="true" codefile="copyjqueryajaxcallwithparameter.aspx.cs" inherits="copyjqueryajaxcallwithparameter" %>    <asp:content id="content1" contentplaceholderid="headcontent" runat="server">  </asp:content>  <asp:content id="content2" contentplaceholderid="maincontent" runat="server">  <script type="text/javascript">        $(document).ready(function () {          $.ajax({              type: 'post',              url: 'accountservice.asmx/getaccountparam',              data: "{ 'account': '90186772'}",              contenttype: 'application/json; charset=utf-8',              datatype: 'json',              success: function (data) {                  var datatableinstance = $('#datatb').datatable({                        data: data,                     // data: data.d,                      columns: [                  { 'data': 'ourbranchid' },                  { 'data': 'accountid' },                  { 'data': 'productid' },                  ]                      });                                   $('#datatb tfoot th').each(function () {                        var title = $('#datatb thead th').eq($(this).index()).text();                      $(this).html('<input type="text"  placeholder="search ' + title + '"/>');                      });                    datatableinstance.api().columns().every(function () {                      var datatablecolumn = this;                      $(this.footer()).find('input').on('keyup change', function () {                            datatablecolumn.search(this.value).draw();                        });                    });                }                });          });                           </script>    <table id="datatb" class="display" cellspacing="0" width="100%" >  <thead>  <tr>  <th>ourbranchid</th>  <th>accountid</th>  <th>productid</th>  </tr>    </thead>   <tfoot>             <tr>  <th>ourbranchid</th>  <th>accountid</th>  <th>productid</th>  </tr>          </tfoot>    </table>      </asp:content>

webservice method:

[webmethod] public void getaccountparam(string account) { datatable dtrsl; list lstacc = new list(); dtrsl = cls.accountdetailparam(account);

     foreach (datarow row in dtrsl.rows)      {          account = new account();            a.ourbranchid = row[0].tostring();          a.accountid = row[1].tostring();          a.productid = row[2].tostring();           lstacc.add(a);       }       javascriptserializer js = new javascriptserializer();      js.maxjsonlength = int32.maxvalue;     // context.response.write(lstacc);      context.response.write(js.serialize(lstacc));      }