Comments by heart1004 (Top 2 by date)

Thanks, it's work to me but I change to :

$("#btnSelectAll").click(function () {
$('#GridID').find("input:checkbox").each(function () {
this.checked = true;
});
});

$("#btnDeselectAll").click(function () {
$('#GridID').find("input:checkbox").each(function () {
this.checked = false;
});
});