ODBC - Retrieving info messages - RAISE NOTICE

Hi,

When executing a PL/pgsql query using powershell with ODBC (yes, a somehow special setup), it is possible to register
tothe event "InfoMessage" (with Register-ObjectEvent) to retrieve all messages that are created for example by using
"RAISENOTICE". 
While this works fine when using MS SQL and the SqlConnection (all print statements are retrieved), it does not work
withPostgres and the OdbcConnection, here, only the last message ("3") is retrieved, when a statement like 
DO $$
RAISE NOTICE '1';
RAISE NOTICE '2';
RAISE NOTICE '3';
END$$;
is executed.

Maybe this is a general constraint when using ODBC, but maybe I am doing something terribly wrong (other than using
powershellwith Postgresql). 

Best regards,
Wolfgang