Transaction number

When working with orders the main identifier is Order.TransactionId, not Order.Id. This is done because the Order.Id generated by the exchange. Because of this, immediately after the execution the Connector.RegisterOrder(StockSharp.BusinessEntities.Order order ) method, for some time the Order.Id can not be initialized. Therefore, at once after the transaction sending, the trading program generates Order.TransactionId.

Order.TransactionId automatically generated by the IdGenerator class. This is an abstract class that has two standard implementations:

• IncrementalIdGenerator - installed by default. It increases the number by 1. The initial value set through the IncrementalIdGenerator.Current, property, and by default, the value is equal to the number of milliseconds since the start of the day.
• MillisecondIdGenerator. It generates the transaction number, which equal to the number of milliseconds from the time of generator creating.