Check if else condition on DropDownList change in ASP.Net MVC using jQuery

I want to apply if else condition on two label

<script type="text/javascript">
    $(document).ready(function () {
        $("#select2-1").change(function () {
            //console.log($("#select2-1").val());
 
            var orderId = $("#select2-1").val();
            if (orderId != "") {
                GetOrderno(orderId);
                GetProduceqty(orderId);
                GetPackedqty(orderId);
                GetOrdernoID(orderId);
            }
            else {
                $("#quantity-label-2").text("QTY");
                $("#orderqty").empty();
            }
        });
    });
 
    function GetOrderno(orderId) {
        $.ajax({
            async: true,
            type: 'GET',
            dataType: 'JSON',
            url: '/OrderPack/GetOrderno',
            data: { orderId: orderId },
            success: function (data) {
                console.log(data);
                //populate the didden field
                $("#orderqty").val(data.orderqty);
                //populate the label
                $("#quantity-label-2").text(data.orderqty);
            },
            error: function () {
                alert("There is some problem to get.");
            }
        });
    }

I am using function to load data into label, so i want idea to how to apply if else condition

function GetOrderno(orderId)