Change url on DropDownList selection change using jQuery in ASP.Net

Hi meetsree83,

Please refer below sample.

HTML

<div>
    <select id="ddlLanguages">
        <option value="hi">Hindi</option>
        <option value="ar">Arabic</option>
        <option value="en">English</option>
    </select>
</div>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        $('#ddlLanguages').on('change', function () {
            var key = "313536323632363935";
            var lang = $(this).find("option:selected").val();
            var url = self.location.href.split('?')[0] + '?Key=' + key + '&lang=' + lang;
            if (url != "") {
                window.location.href = url;
            }
        });
    });
</script>

Screenshot