ASP.NET MVC5 - Hae Ajaxilla arvo tietokannasta

http://stackoverflow.com/questions/33733197/pass-value-to-a-textbox-using-mvc-5

<script type="text/javascript">
    $(document).ready(function () {
        $("#txtid").change(function () {
            $.ajax({
                url: '/CommissionsFinals/GetTarifa',
                type: 'GET',
                contentType: "application/json; charset=utf-8",
                dataType: 'json',
                data: { clientID: $("#DDLCliente").val(), consultorID: $("#DDLConsultor").val() },

                success: function (tarifa) {
                    //response(tarifa.
                    $('#txtid').val(tarifa).autocomplete

                },
                error: function () {
                    alert('Error!');
                }
            });

        })
    });