Knowing when a row is locked by another user

In Visual Basic/Oracle, can I test the return code from a "select for update"? I would like to know when the row is locked by another user.

Write a SELECT ..... FOR UPDATE NOWAIT SQL statement. If the row is locked, you will get an "ORA-0054 ERROR: resource is busy" error message. If no error is given, then you are locking the record. After the update, you must release locks by COMMITTING the changes.

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