// ==================================================================================
        //                                   AJAX Response Methods
        // ==================================================================================

        //*******************************************************************************
        //                              Invoice Methods
        //*******************************************************************************
        public JsonResult AddInvoice(string customerId)
        {
            IInvoiceDataService dataService = new InvoiceDataService();
            object inserResult = dataService.AddInvoice(invoiceContext, sequenceContext, customerId);

            return(Json(inserResult, JsonRequestBehavior.AllowGet));
        }