kendo grid refresh
// reads new changes from server
$('#GridName').data('kendoGrid').dataSource.read();
// just load data on client side
$('#GridName').data('kendoGrid').refresh();
// get dataItem by ID; uidNoteId is ID field
var grid = $("#mainGrid").data("kendoGrid");
var dataItem = grid.dataSource.get(uidNoteId);
dataItem["IsRead"] = true;
grid.refresh();