If the connection assigned to the command is in a locally suspended transaction, ExecuteReader requires that the command have a transaction. The Transaction property of the command has not been initialized

{system.invalidoperationexception: If the connection assigned to the command is in a locally pending transaction, ExecuteReader requires the command to have a transaction. The Transaction property of the command has not been initialized.
In System.Data.OleDb.OleDbConnectionInternal.ValidateTransaction (oledbtransaction transaction, String method)
In System.Data.OleDb.OleDbConnection.ValidateTransaction (oledbtransaction transaction, String method)
In System.Data.OleDb.OleDbCommand.ValidateConnectionAndTransaction (String method)
In System.Data.OleDb.OleDbCommand.ExecuteReaderInternal (CommandBehavior behavior, String method)
In System.Data.OleDb.OleDbCommand.ExecuteReader (CommandBehavior behavior)
In System.Data.OleDb.OleDbCommand.System.Data.IDbCommand.ExecuteReader (CommandBehavior behavior)
In System.Data.Common.DbDataAdapter.FillInternal (DataSet DataSet, datatable[] DataTables, Int32 Startrecord, Int32 MaxRecords, String srctable, IDbCommand command, CommandBehavior behavior)
In System.Data.Common.DbDataAdapter.Fill (DataSet DataSet, Int32 Startrecord, Int32 maxrecords, String srctable, IDbCommand command, CommandBehavior behavior)
In System.Data.Common.DbDataAdapter.Fill (DataSet DataSet, String srctable)
In Ytud. Public.DB.GetDataTable (String Sql, OleDbConnection dbcon) location F:\CsProjects\yytd\standrd2014-9-6\ytud\Public\DB.cs: Line number 57
In Ytud. Mainfrm.importdb_importproject (String srcdbfilepath) position F:\CsProjects\yytd\standrd2014-9-6\ytud\Main.cs: line number 2084}

This is because the connection object used by the OleDbCommand object opens the transaction, but does not specify the transaction for the transaction property of the OleDbCommand object.

If the connection assigned to the command is in a locally suspended transaction, ExecuteReader requires that the command have a transaction. The Transaction property of the command has not been initialized