public void DeleteInvoice(int id, out string errorMessage)
        {
            errorMessage = "OK";
            DAInvoices daInvoices = new DAInvoices();

            daInvoices.DeleteInvoice(id);
            errorMessage = "Factura stearsa!";
        }
        public void UpdateInvoice(InvoiceModel factura, out bool status, out string errorMessage)
        {
            status       = false;
            errorMessage = "OK";
            DAInvoices daFacturi = new DAInvoices();

            daFacturi.UpdateInvoice(factura);
            errorMessage = "Factura adaugata!";
        }
        public DataTable GetInvoicesById(int clientId)
        {
            DAInvoices daFacturi = new DAInvoices();
            DataTable  dataTable = new DataTable();

            try
            {
                dataTable = daFacturi.GetInvoicesById(clientId);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            return(dataTable);
        }