var grid = $("#grid").getKendoGrid();
grid.bind("saveChanges", function (e) {
    var data = grid.dataSource.data();

   // collect updated rows and new rows
    var items = $.grep(data, function (item) {
        return item.dirty || item.id === 0;
    })

    // collect deleted rows
    $.each(grid.dataSource._destroyed, function (index, item) {
        item.IsDeleted = true;
        items.push(item);
    })

    $.ajax({
        type: "POST",
        data: items,
        url: "save",
        contentType: "application/json; charset=utf-8",
        processData: true,
        cache: false,
    })
    .done(function (response, textStatus, jqXHR) {
        // do something
    })
    .fail(function (jqXHR, textStatus, errorThrown) {
       // How do i inform datasource or grid about error

    })

})