ODP.NET

Hello Forum Members,

I am experiencing very interesting problem in my ASP.NET application when I am changing the user password in ORACLE database using "ALTER USER..." command from inside of my code.
Example:
The user "TestUserName" has the current password, let's say "User1".
After I change the password to "User2", I can login into my application with the OLD and with the NEW passwords by some reason?
If I check the password for the current "TestUserName" in the database, it has the newest value ("User2"). From the SQLPlus I can login into the database only with the newest password. But from my application I can still login using both passwords? If I close the application, close the browser and start the application again, I still can login using two passwords. But, if I restart the PC, the old password disappeared. What is going on?

Any suggestions?

Thanks in advance,
-Dmitriy