public void SelectVehicle(string plateNum)
        {
            FormRentDetails = new FormRentDetails(this);
            FormRentDetails.displayRentalDetails(plateNum);


            //keep this plateNum, create a transaction, add this plate number
            //take customer, add into this transaction object's attribute value
            //pass this object to the DAO to save it to database
        }
        public void SelectVehicle(string plateNum)
        {
            FormRentDetails = new FormRentDetails(this);
            FormRentDetails.DisplayRentalDetails(plateNum);

            try
            {
                VehicleDAO.Instance.OpenConnection();
                formRentDetails.Record.RentedVehicle = VehicleDAO.Instance.RetrieveVehicle(plateNum);
            }
            catch (Exception)
            {
                throw;           // preserve stack trace
            }
            finally
            {
                VehicleDAO.Instance.CloseConnection();
            }
        }