jQuery Grid Plugin - jqGrid

Hello Everybody,

                         jqGrid is really really good. I've made demos using asp.net and webservice (asmx) and handler (ashx). But my question is, can I call methods from c# code behind? I've an idea of using it in my project. We cannot use WebService in our current project, that is the reason I need to use in c# code behind.

<script type="text/javascript">
        jQuery(document).ready(function() {
            var data = "{}";
            var jsonStr = JSON.stringify(data);
            var lastSel;
            $('#list').jqGrid({
                datatype: function() {
                    $.ajax({
                        url: "jqGridDemo.asmx/NewMethod",
                        data: "{}",  // For empty input data use "{}",
                        dataType: "json",
                        mtype: "GET",
                        contentType: "application/json; charset=utf-8",
                        complete: function(jsondata, stat) { alert((jsondata.responseText));
                            if (stat == "success") {
                                var thegrid = jQuery("#list")[0];
                                thegrid.addJSONData(JSON.parse(jsondata.responseText).d);
                            }
                        }
                    });
                },
                colNames: ['User ID', 'User Name', 'Location'],
                colModel: [
          { name: 'ID', index: 'ID', width: 80, align: 'left', editable: false },
          { name: 'Name', index: 'Name', width: 120, align: 'left', editable: true},
          { name: 'Location', index: 'Location', width: 60, align: 'left', editable: true, edittype: "select", editoptions: { value: "MDU:Madurai; BAN:Bangalore; CHE:Chennai"}}],
                pager: jQuery('#pager'),
                rowNum: 5,
                rowList: [10, 20, 30],
                sortname: 'ID',
                sortorder:'desc',
                viewrecords: true,
                imgpath: 'jqGrid-3.4.3/themes/coffee/images',
                caption: 'jqGrid First Grid',
                width: 300,
                editurl: "operation.ashx"
              }).navGrid(pager, { edit: true, add: true, del: true, search: false });
        });
    </script>

In the above code, the highlighted code is used to call the "NewMethod" from WebService. Instead of jqGridDemo.asmx, how can I call the c# code behind's method? If anyone have any idea, please let me know.

Thanks,

achu