jQuery Grid Plugin - jqGrid

Hi

I am sorry I am new in using Jqgrid. I need to pass one of colModel to dataUrl to get specific dropdown list I try a lot but every time come empty or undefine this my Code

colModel: [ { name: "ANALYTECODE", index: "ANALYTECODE", width: 70, sortable: false, hidden: true },

{ name: "USERFIELD1", index: "USERFIELD1", width: 100, sortable: false, align: 'center', editable: true, edittype: "select",
                     editoptions: { dataUrl: '<%: Url.Content("~/")%>' + "Jobs/GetUpperScheme?ANALYTECODE=" + ANALYTECODE,

                         buildSelect: function (data) {
                             var response = jQuery.parseJSON(jQuery.parseJSON(data).UpperScheme);
                             var s = '<select>';
                             //                            var valUSERFIELD1 = jQuery("#" + subgrid_table_id).jqGrid('getRowData', selr).USERFIELD1
                             //                            s += '<option value="' + valUSERFIELD1 + '">' + valUSERFIELD1 + '</option>';
                             if (data) {
                                 for (var i = 0, l = response.Head.length; i < l; i++) {
                                     var ri = response.Head[i];
                                     s += '<option value="' + ri.ITEM + '">' + ri.ITEM + '</option>';
                                 }
                             }
                             return s + "</select>";
                         }

                     }
                 },

Can any one help me

Thanks

Youssif