CO Cancel Order

I can't close CO position with code. My Code snippet is
kite.CancelOrder(order.OrderId, Constants.VARIETY_CO, order.ParentOrderId);

please correct my code.

Nothing is happening. here is the code snippet

List orders = kite.GetOrders().Where(o => o.Status == "OPEN" && scriptNames.Contains(o.Exchange + ":" + o.Tradingsymbol) && o.ParentOrderId != "").ToList();

if (order.Product == "CO" && order.Tag == tagString)
{
kite.CancelOrder(order.OrderId, Constants.VARIETY_CO, order.ParentOrderId);
await Task.Delay(334);
}

this is the complete code base,

List<Order> orders = kite.GetOrders().Where(o => o.Status == "OPEN" && scriptNames.Contains(o.Exchange + ":" + o.Tradingsymbol) && o.ParentOrderId != "").ToList();
            writeLog(logFile, "End kite.GetOrders()");
            foreach (Order order in orders)
            {
                try
                {
                    if (orders.Where(o => o.ParentOrderId == order.ParentOrderId && o.Product == "BO" && o.Tag == tagString).ToList().Count > 0)
                    {
                        kite.CancelOrder(order.OrderId, Constants.VARIETY_BO, order.ParentOrderId);
                        await Task.Delay(334);
                    }
                    else if (order.Product == "CO" && order.Tag == tagString)
                    {
                        writeLog(logFile, "Cancelling CO Order");
                        kite.CancelOrder(order.OrderId, Constants.VARIETY_CO, order.ParentOrderId);
                        await Task.Delay(334);
                    }
                }
                catch (Exception ex)
                {
                    writeLog(logFile, "Error: " + ex.Message);
                }
            }