jqgrid filter column doesn't work in mvc asp.net

Question

I'm new in jqgrid and i have a problem with column filters in an mvc c# application. If i filter using filter tollbar it doesn't filter anyting, even with serch button. Somebody can help me? Here my code in the View (in Controller i've putted get method that return data from sql in json format)

<div>
    <table id="grid"></table>
    <div id="pager"></div>
</div>

<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.11.4/themes/redmond/jquery-ui.min.css">
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.0/css/font-awesome.min.css">
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/free-jqgrid/4.13.3/js/jquery.jqgrid.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/free-jqgrid/4.13.4/css/ui.jqgrid.min.css">
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/free-jqgrid/4.13.4/js/jquery.jqgrid.min.js"></script>

<script>
   $(function () {
   
       $grid = $("#grid"),
           initDatepicker = function (elem) {
               $(elem).datepicker({
                   dateFormat: "dd-M-yy",
                   autoSize: true,
                   changeYear: true,
                   changeMonth: true,
                   showButtonPanel: true,
                   showWeek: true
               });
           };

       $grid.jqGrid
           ({
               url: "/controller/jsonAction",
               datatype: 'json',
               mtype: 'Get',
   
               //table header name
               colNames: ['Id', 'colDate', 'colText', 'colText1', 'colText2', 'colText3', 'colText4', 'colChar', 'colChar1', 'colText5'],
               //colModel takes the data from controller and binds to grid
               colModel: [
                   {
                       key: true,
                       hidden: true,
                       name: 'ID',
                       editable: false
                   },
   
                   {
                       name: "col1DateType", sorttype: "date",
                       formatter: "date", formatoptions: { newformat: "d-M-Y" },
                       editoptions: { dataInit: initDatepicker },
                       searchoptions: { sopt: ["eq", "ne", "lt", "le", "gt", "ge"], dataInit: initDatepicker }
                   },
   
                   {
                       name: "col2TextType", width: 193, cellattr: function (rowId, tv, rawObject, cm, rdata) {
                           return 'style="white-space: normal;"';
                       }
                   },
   
                   {
                       name: "Col3Texttype", cellattr: function (rowId, tv, rawObject, cm, rdata) {
                           return 'style="white-space: normal;"';
                       }
                   },
   
                   {
                       name: "col4ComboTypeText", formatter: "select",
                       edittype: "select", editoptions: { value: "test:test;test1:test1;test2:test2", defaultValue: "IN" },
   
                       stype: "select", searchoptions: { sopt: ["eq", "ne"], value: ":[All];test:test;test1:test1;test2:test2" }
                   },
   
                   { name: "col5TypeText" },
   
                   { name: "col6TypeText" },
   
                   {
                       name: "col7ComboTypeChar", width: 100, formatter: "select",
                       edittype: "select", editoptions: { value: "L:L;M:M;H:H", defaultValue: "IN" },
                       stype: "select", searchoptions: { sopt: ["eq", "ne"], value: ":[All];L:L;M:M;H:H" }
                   },
   
                   {
                       name: "col8ComboTypeChar", width: 100, formatter: "select",
                       edittype: "select", editoptions: { value: "L:L;M:M;H:H", defaultValue: "IN" },
                       stype: "select", searchoptions: { sopt: ["eq", "ne"], value: ":[All];L:L;M:M;H:H" }
                   },
   
                   {
                       name: "col9ComboTypeText", formatter: "select",
                       edittype: "select", editoptions: { value: "test3:test3;test4:test4;test5:test5", defaultValue: "IN" },
                       stype: "select", searchoptions: { sopt: ["eq", "ne"], value: ":[All];test3:test3;test4:test4;test5:test5" }
                   }
               ],
               cmTemplate: { autoResizable: true },
               iconSet: "fontAwesome",
   
               pager: true,
               autoencode: true,
               sortname: "invdate",
               sortorder: "desc",
               search: true,
   
               shrinkToFit: false,
               multiPageSelection: true,
   
               pager: jQuery('#pager'),
               rowNum: 10,
               rowList: [10, 20, 30, 40],
               height: '100%',
               width: '100%',
               viewrecords: true,
               loadonce: false,
              
               emptyrecords: 'No records to display',
               jsonReader:
               {
                   root: "rows",
                   page: "page",
                   total: "total",
                   records: "records",
                   repeatitems: false,
                   Id: "0"
               },
               autowidth: true,
               multiselect: false,
             
               searching: {
                   searchOnEnter: true,
                   stringResult: true,
                   defaultSearch: "cn",
                   multipleSearch: true,
                   multipleGroup: true,
                   searchOnEnter: true,
                   closeOnEscape: true
               }
              
           }).navGrid('#pager', { edit: false, add: false, del: false, search: true }
   
           ).jqGrid("filterToolbar");
   
      
     
   
   });
   
   
   
</script>

I've tried a lot of suggestion from stackoverflow, but no one works for me. I'm probably doing something wrong, but I don't know what,