private void Handle(OrderCancelReject msg) { var reason = ""; if (msg.IsSetCxlRejReason()) { switch (msg.CxlRejReason.Obj) { case CxlRejReason.TOO_LATE_TO_CANCEL: reason = "Too late to cancel"; break; case CxlRejReason.ORDER_ALREADY_IN_PENDING_CANCEL_OR_PENDING_REPLACE_STATUS: reason = "Order already in PendingCancel or PendingReplace status"; break; default: reason = $"#{msg.CxlRejReason.Obj}"; break; } } _killOrderTransactions.Reject(msg.ClOrdID.Obj, reason); _modifyOrderTransactions.Reject(msg.ClOrdID.Obj, reason); }