private void btnChangeStatus_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(SelectedOrderID))
            {
                Constants.DeliveryStatus newDeliveryStatus = new Constants.DeliveryStatus();
                Constants.DeliveryStatus oldDeliveryStatus = EnumHelper.Parse <Constants.DeliveryStatus>(_selectedOrder.order_status);
                if (oldDeliveryStatus != Constants.DeliveryStatus.Delivered)
                {
                    switch (oldDeliveryStatus)
                    {
                    case Constants.DeliveryStatus.Waiting:
                        newDeliveryStatus = Constants.DeliveryStatus.Delivering;
                        break;

                    case Constants.DeliveryStatus.Delivering:
                        newDeliveryStatus = Constants.DeliveryStatus.Arrived;
                        break;

                    case Constants.DeliveryStatus.Arrived:
                        newDeliveryStatus = Constants.DeliveryStatus.Delivered;
                        if (_selectedOrder.payment_status.Equals(Constants.PaymentStatus.Unpaid.ToString()))
                        {
                            if ((new IrregularOrderPaymentView(_selectedOrder, ucItemsList.OrderItems)).ShowDialog() == DialogResult.OK)
                            {
                                _selectedOrder.payment_status = Constants.PaymentStatus.Paid.ToString();
                            }
                            else
                            {
                                return;
                            }
                        }
                        break;

                    default: break;
                    }
                    _selectedOrder.order_status = newDeliveryStatus.ToString();
                    string result = _business.Update(_selectedOrder);
                    if (string.IsNullOrEmpty(result))
                    {
                        MessageBox.Show("Đơn hàng đã cập nhật thành công.");
                        DataBind();
                    }
                    else
                    {
                        MessageBox.Show(result, Constants.Messages.ERROR_CAPTION, MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
        }
        private void btnChangeStatus_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(SelectedOrderID))
            {
                Constants.DeliveryStatus newDeliveryStatus = new Constants.DeliveryStatus();
                Constants.DeliveryStatus oldDeliveryStatus = EnumHelper.Parse <Constants.DeliveryStatus>(_selectedOrder.order_status);
                if (oldDeliveryStatus != Constants.DeliveryStatus.Delivered)
                {
                    switch (oldDeliveryStatus)
                    {
                    case Constants.DeliveryStatus.Waiting:
                        newDeliveryStatus = Constants.DeliveryStatus.Delivering;
                        break;

                    case Constants.DeliveryStatus.Delivering:
                        newDeliveryStatus = Constants.DeliveryStatus.Arrived;
                        break;

                    case Constants.DeliveryStatus.Arrived:
                        newDeliveryStatus = Constants.DeliveryStatus.Delivered;
                        break;

                    default: break;
                    }
                    _selectedOrder.order_status = newDeliveryStatus.ToString();
                    string result = _business.Update(_selectedOrder);
                    if (string.IsNullOrEmpty(result))
                    {
                        MessageBox.Show("Đơn hàng đã cập nhật thành công.");
                        DataBind();
                    }
                    else
                    {
                        MessageBox.Show(result, Constants.Messages.ERROR_CAPTION, MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
        }