SqlCommandBuild er + transaction

[DG]

I use this code:

_adapter = new SqlDataAdapter( selectString, _conn);
_adapter.Select Command = new SqlCommand(sele ctString, _conn);
_adapter.Select Command.Transac tion = _trans;
_builder = new SqlCommandBuild er(_adapter);
_adapter.Update (dt);

i get exception:
Execute requires the command to have a transaction object when the
connection assigned to the command is in a pending local transaction. The
Transaction property of the command has not been initialized.

Now, it worked on other DB! (!?).

Also:
after:
_builder = new SqlCommandBuild er(_adapter);
_adapter.Update Command , InsertCommand & DeleteCommands are null !!??, so i
can't check if Transaction property is set or not. (same thing on other DB
but update works there)
SqlCommand builder uses Transaction from SelectCommand, so there sould not
be problem.

It works OK without transaction.

Any ideas?
Thanx.