My Code Is:-
using Visual studio
<script src="Scripts/jquery-3.3.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
function mainmanu() {
$(" #nav ul ").css({ display: "none" });
$(" #nav li").hover(function () {
$(this).find('ul:first').css({ visibility: "visible", display: "none" }).show(400);
}
, function () {
$(this).find('ul:first').css({ visibility: "hidden" });
});
}
$(document).ready(function () {
mainmenu();
});
</script>