Ajax call and kendo data source together

Hello
     I have a requirement where I ll do a $.ajax call and then store the ajax call response to a kendo datasource...like below
   $.ajax({
                url: url,              
                type: 'POST',
                contentType: 'application/json',
                dataType: 'json',
                success: function (responsedatas) {
                     ///I got datas here..If i put debugger im able to see the datas
                      var KendoSource = new kendo.data.DataSource({ data: responsedatas});
                       $("#grid").kendoGrid({
                    dataSource: {
                        data: KendoSource
                    },
                    height: 360,
                    groupable: false,
                    scrollable: false,
                    sortable: false,
                    pageable: false,
                    columns: [{
                        field: "ContactID",

                        title: "ContactID"
                    }]
                });
                }
            });

If i do the above code...My grid doesn't have datas... If i give the responsedatas directly to the grid data..IM able to get the grid properly..But i wanna use kendosource..I was testing this kendosource to work..I have lots of requirements on kendosource...