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01.@(Html.Kendo().Chart(Model)02.    .Name("graphicchart")03.    .Title(title => title.Text(ViewBag.graphictitle))04.    .Legend(legend => legend05.        .Position(ChartLegendPosition.Bottom)06.    )07.    .ChartArea(chartArea => chartArea08.        .Background("transparent")09.    )10.   .SeriesDefaults(seriesDefaults =>11.        seriesDefaults.Line()12.    )13.    .Series(series =>14.    {15.        series.Line(model => model.Parvalue).Name("Valor").Labels(true).Markers(true).Width(3).Opacity(0.8);16.    })17.    .CategoryAxis(axis => axis18.        .Categories(model => model.Datetimevalue)19.        .MajorGridLines(lines => lines.Visible(false))20.        .Labels(labels => labels.Rotation(-90))21.        .Date()22.        .BaseUnitStep(10)23.        .MinorGridLines(lines => lines.Visible(true))24.    )25.    .Tooltip(tooltip => tooltip26.        .Visible(true)27.        .Format("{0}")28.    )29.)columns.Template(@<text></text>).ClientTemplate("<img class='undoButton' style='width:16px;' src='Content/images/undo.png' />").Width(32);<script type="text/javascript">        // Undo functionality        $('#activity-grid').on('click', '.undoButton', function (e) {            e.preventDefault();              //alert('undo');              var grid = $('#activity-grid').data().kendoGrid;            var dataItem = grid.dataItem($(this).closest('tr'));              dataItem.dirty = false;              grid.dataSource.cancelChanges(dataItem); // works              //grid.refresh(); // only way to show the changes in the UI        });</script>Using "contains" filter gives me all rows that do not have the specified value. How can I filter grid rows that do not contain a certain value, so that I only get rows that do have the value? I tried "doesnotcontain" which doesn't work.
if (val) {                grid.dataSource.filter({                    logic: "or",                    filters: [                    { field: "someField", operator: "contains", value: val },                   { field: "someField2", operator: "contains", value: val },...