Validate default value in ASP.Net DropDownList on Button Click using jQuery

Hi akhter,

Refer below modified code. You need to use return statement. If all valid then return true else false.

<script type="text/javascript">
    $(function () {
        $(".js-example-placeholder-single").select2({
            placeholder: "Select",
            allowClear: true
        });

        $("[id$=btn_Gen]").click(function () {
            var isValid = true;
            if ($("[id$=lbdispatchID]").html() == '') {
                isValid = false;
                //Selected option from dropdownlist
                alert("Please Select Dispatch.");
            }
            else if ($("[id$=DDLcus]").val() == '0') {
                isValid = false;
                //Not selected so alert user to select any option
                alert("Please Select Customer.");
            }
            else if ($("[id$=ddlcurrency]").val() == '0') {
                isValid = false;
                //Not selected so alert user to select any option
                alert("Please Select Currency.");
            }

            return isValid;
        });
    });
</script>