Your code
$("#CheckBox1").attr("disabled", true);
doesn't work because jQuery expects only one element matching a specific ID. Your HTML is invalid; the IDs of elements need to be unique. Change your HTML and have the jQuery selector use a class or the "name" attribute. You should also be disabling them with
prop()
instead of
attr()
:
$(".chkbxq").prop("disabled", true);
OR
$("input[name='chkOrder']").prop("disabled", true);