Accessing webpage method from another class

How can I access a public method in an partial Webpage class from a WebService (or other class)?


I can't even find the class (_Default) from the WebService as it's partial. Hopefully it's pretty basic, but have no luck on Google (wrong search parameters probably)...



public partial class _Default : System.Web.UI.Page {
    public void UpdateControls() {
    }
}
...