ASP.NET 3.5 Permissions on IIS 6

I have an asp.net page which changes passwords in the OU. Where do I set the user which actually runs my code?

In the virtual directory security settings, is it the application pool user? Or is it in Web.config? Which one of the configurations actually configur开发者_JAVA技巧es the user that runs the asp.net code?

---

The identity of the user under which a web application runs is defined by the application pool which the web application uses. All of this can be seen and set in Internet Information Server (IIS) Manager.

---

As far as I know the Identitiy with which a aps.net application is run is set in the properties for the web application.