The ULTransaction object in which the ULCommand object executes. This should be the current transaction of the connection
specified by the ULCommand.Connection object. The default is a null reference (Nothing in Visual Basic).
If a command is reused after a transaction has been committed or rolled back, this property needs to be reset.
This is the strongly-typed version of System.Data.IDbCommand.Transaction and System.Data.Common.DbCommand.Transaction.