"Audit Login" and "Audit Logout" and pooling

my application has 3 services on the server which uses ADO to connect to the SQL server and make stored procedure calls. My main concern is the events indicate that there is no database connection pooling going on.
When i run the profiler i see the audit events every second and for each of the services.
it just has this information
-- network protocol: TCP/IP
set quoted_identifier on
set arithabort off
set numeric_roundabort off
set ansi_warnings on
set ansi_padding on
set ansi_nulls on
set concat_null_yields_null on
set cursor_close_on_commit off
set implicit_transactions off
set language us_english
set dateformat mdy
set datefirst 7
set transaction isolation level read committed

Any ideas ?

IIRC, connection pooling will only happen if the connection string from the calling app is identical to one used for a sleeping connection.
Are you using integrated security?

Thank you for the response. Yes the connection string is exactly the same. tried both integrated and sa/passwd . it behaves the same way...