private bool AddPayment(DateTime TimeNow, Booking book) { bool rs = false; try { //string was not reconize as a datetime??? float fullcost = CalcuDays(DateTime.Parse(txtCheckIn.Text), DateTime.Parse(txtCheckOut.Text), book.Breakfirst, book.Nights); // MessageBox.Show("Full cost để add được vào payment mới là: " + fullcost); Payment pay = new Payment() { Amount = fullcost, Cancelled = false, Paid = fullcost * 0.3f, BookingID = book.BookingID, CustomerID = txtCusID.Text }; rs = ManagerDAL.AddNewPayment(pay); } catch (Exception ex) { MessageBox.Show(ex.Message); } return(rs); }