Greetings, I usually write code like this

        Try
            Me.SaveFields("Save")

            '... some code here

        Catch
           'if an exception is here and the adapter is in a transaction, 
           'I get an error if I try to rollback the fields ???... why?
            If Not adapter.IsTransactionInProgress Then
                Me.RollbackFields("Save")
            End If
            If isRootTransaction Then
                adapter.Rollback()
            End If
            Throw

        Finally
            If isRootTransaction Then
                adapter.CloseConnection()
                adapter.Dispose()
            End If
        End Try

The lines in question are those handling the RollbackFields. Why does this cause an error if the adapter is in the middle of a Transaction but works OK if NOT ??

           'if an exception is here and the adapter is in a transaction, 
           'I get an error if I try to rollback the fields ???... why?
            If Not adapter.IsTransactionInProgress Then
                Me.RollbackFields("Save")
            End If

Hmm.

A transaction already saves the fields so it's not necessary. Though rollback should work even during a transaction...