在Select（DropDown）更改事件上重新初始化Jquery DataTable

我正在使用Jquery UI DataTable，该select(DropDown) change事件已填充。在PageLoad其确定。当我执行dropdown change事件时，DataTable是Reinitialized通过使用fnDestroy()，但是格式会DataTable发生变化。下面是我的代码。

  campusChangeEvent = function () {
        $('#cmbClassCP').on('change', function () {
        $('#ClassRegistredDataTable').dataTable().fnDestroy();
            GetAllClassbyCampus($('#cmbClassCP :selected').val());
        });
    }, 

 GetAllClassbyCampus = function (id) {
        var oTable = $('#ClassRegistredDataTable').dataTable({
            "bJQueryUI": true,
            "sPaginationType": "full_numbers",
            "bServerSide": true,
            "bRetrieve": true,
            "bDestroy": true,
            "sAjaxSource": "/forms/Setup/Setup.aspx/GetAllClassBycampus?CampusId=" + id,
            "fnServerData": function (sSource, aoData, fnCallback) {
                $.ajax({
                    "type": "GET",
                    "dataType": 'json',
                    "contentType": "application/json; charset=utf-8",
                    "url": sSource,
                    "data": aoData,
                    "success": function (data) {
                        fnCallback(data.d);
                    }
                });
            },
            "aoColumns": [
                         {
                             "mDataProp": "RowNo",
                             "bSearchable": false,
                             "bSortable": false,
                             "sWidth": "20"
                         },
                        {
                            "mDataProp": "CampusName",
                            "bSearchable": false,
                            "bSortable": false,

                        },
                        {
                            "mDataProp": "ClassName",
                            "bSearchable": true,
                            "bSortable": false

                        },
                        {
                            "mDataProp": "Section",
                            "bSearchable": false,
                            "bSortable": false
                        },
                        {
                            "mDataProp": "Description",
                            "bSearchable": false,
                            "bSortable": false
                        },
                        {
                            "mData": null,
                            "bSearchable": false,
                            "bSortable": false,
                            "fnRender": function (oObj) {
                                return '<a class="edit" href="">Edit</a>';

                            }
                        }
            ]
        });

我的表格看起来Page Load像..

后DropDown变化事件，看起来像下面..

任何帮助...。