Databases :: Oracle Stored Proc Optionally Returning A Ref Cursor?

I would like to use a technique for exception handling on our database stored procs whereby, each proc exposes a p_error_code output parameter of type int. 0 indicates no error, and other values indicate application specific exceptions. Now, where a stored proc will return a ref cursor if no exceeptions occur, we would like to check the p_error_code and if not 0, then use the ref cursor. If an exception does occur, then the stored proc may or may not have populated the ref cursor, but the dotnet code will almost definately not read the contents.

OracleCommand command = CommandFactory.CreateCommand(transaction, "RTS.p_get_audit_trail");