JavaScript Actionを変更

 JavaScript actionの変更

    <input id="AreasBackAction" type="hidden" value="@Url.Action("StationAreasBack","Reserve")" />

<Script>

function onSubmit() {

        var formObject = document.getElementById('AreaForm');
        formObject.action = $('#AreasBackAction').val();
        document.forms['AreaForm'].submit();

}

</Script>