public string RefundPayment(int paymentid, int customer_id, int staff_id, int rental_id, decimal amount, DateTime paymentDate, string movie_title)
        {
            //string conn = "server=localhost; userid=root;password=ecetera;database=sakila;";
            //Use the 'client' variable to call operations on the service.
            string info = "";


            CardConsumer cc = new CardConsumer();
            //here just use a randon credti card since we are not fully simulating a bank and accounts etc
            string ccnumber = RandomCreditCardNumberGenerator.GenerateMasterCardNumber();


            //apply credit via the bank service
            cc.Credit(ccnumber, double.Parse(amount.ToString()));


            //account this refund in sakila database payment table

            using (MySqlConnection connection = new MySqlConnection(GetConnection()))
            {
                MySqlCommand cmd = new MySql.Data.MySqlClient.MySqlCommand();
                cmd.Connection = connection;
                cmd.Parameters.AddWithValue("@customer_id", customer_id);
                cmd.Parameters.AddWithValue("@staff_id", staff_id);
                cmd.Parameters.AddWithValue("@rental_id", rental_id);
                cmd.Parameters.AddWithValue("@amount", amount);
                cmd.Parameters.AddWithValue("@payment_date", paymentDate);
                cmd.Parameters.AddWithValue("@lastupdate", DateTime.Now);

                cmd.CommandText = "INSERT INTO payment(customer_id,staff_id,rental_id,amount,payment_date,last_update) VALUES" +
                                  "(@customer_id, @staff_id, @rental_id, @amount, @payment_date, @lastupdate);";
                try
                {
                    connection.Open();
                    int result = cmd.ExecuteNonQuery();
                    if (result == -1)
                    {
                        info = "error in refunding amount";
                    }
                    else
                    {
                        info = "success";
                    }
                }
                finally
                {
                    connection.Close();
                }
            }
            return(info);
        }
        public string RefundPayment(int paymentid, int customer_id, int staff_id, int rental_id, decimal amount, DateTime paymentDate, string movie_title)
        {
            //string conn = "server=localhost; userid=root;password=ecetera;database=sakila;";
            //Use the 'client' variable to call operations on the service.
            string info = "";

            CardConsumer cc = new CardConsumer();
            //here just use a randon credti card since we are not fully simulating a bank and accounts etc
            string  ccnumber = RandomCreditCardNumberGenerator.GenerateMasterCardNumber();

            //apply credit via the bank service
            cc.Credit(ccnumber,double.Parse(amount.ToString()));

            //account this refund in sakila database payment table

            using (MySqlConnection connection = new MySqlConnection(GetConnection()))
            {
                MySqlCommand cmd = new MySql.Data.MySqlClient.MySqlCommand();
                cmd.Connection = connection;
                cmd.Parameters.AddWithValue("@customer_id", customer_id);
                cmd.Parameters.AddWithValue("@staff_id", staff_id);
                cmd.Parameters.AddWithValue("@rental_id", rental_id);
                cmd.Parameters.AddWithValue("@amount", amount);
                cmd.Parameters.AddWithValue("@payment_date", paymentDate);
                cmd.Parameters.AddWithValue("@lastupdate", DateTime.Now);

                cmd.CommandText = "INSERT INTO payment(customer_id,staff_id,rental_id,amount,payment_date,last_update) VALUES" +
                    "(@customer_id, @staff_id, @rental_id, @amount, @payment_date, @lastupdate);";
                try
                {
                    connection.Open();
                    int result = cmd.ExecuteNonQuery();
                    if (result == -1) info = "error in refunding amount";
                    else info = "success";
                }
                finally
                {
                    connection.Close();

                }
            }
            return info;
        }