Jquery Use Returned Value of Json object

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 $('#SubmitAttribute').click(function () {
        var productid = $('#ProductId :selected').val();

        var source = {
            'ProductId': $('#ProductId :selected').val(),
            'ProductAttributeId': $('#ProductAttributeId :selected').val(),

        }
        $.ajax({
            type: "POST",
            datatype: 'jsonp',
            data: source,
            url: "/api/ProductAttributeMapping/",
            success: function (results) {
                resultvalue = results;

            }

        }).done(function (data, status, jqXHR) {
            $('#attributelist').html("");

            $.getJSON('/ProductAttributes/GetAttributes/' + resultvalue.ProductId, function (data) {


                $.each(data, function (index, items) {
                    $("#attributelist").append(items.Text + '<br />');
                });
            })
        });
    });

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