asp.net page timeouts in Web application depends on

1. The shutdowntimeout property for the Application pool being used (go through IIS).
2. The Scripttimeout property for the application.
3. The Connecttimeout property to the database
4. The Commandtimeout property for the connection
5. The Asynch timeout property for the Ajax ScriptManager on the page (if you are using AJAX).
6. The HTTPRunTIme executionTimeOut property in the web.config file.