protected void btnUpdate_Click(object sender, EventArgs e) { Order order = OrderDA.GetOrderByID(Convert.ToInt32(orderID.Value)); Employee employee = EmployeeDA.GetEmployeeByID(Convert.ToInt32(driverList.SelectedValue)); if (DeliveryDA.GetDeliveryByOrderID(order.OrderID) != null) { DeliveryDA.UpdateDriverForOrder(order, employee); } else { DeliveryDA.AddDriverToOrder(order, employee); } Response.Redirect("OrdersList.aspx"); }