Assembly: System.Data.SqlServerCe (in System.Data.SqlServerCe.dll)
The property was changed while a transaction was in progress.
SQL Server Compact supports multiple simultaneous connections as well as multiple commands sharing the same connection. Thus, it is possible to have multiple instances of SqlCeDataReader open on the same connection. This behavior differs from that of System.Data.SqlClient.
If you set while a transaction is in progress and the Transaction property is not null, an InvalidOperationException is generated. If the Transaction property is not null and the transaction has already been committed or rolled back, Transaction is set to null.