This interface provides methods for tracking the state of a Web Forms document, handling load-time events, determining a document's location, setting a document selection, and managing a document's "Undo" service.

public interface IWebFormsDocumentService {
// Public Instance Properties
   public string DocumentUrl{get; }
   public bool IsLoading{get; }
// Public Instance Methods
   public object CreateDiscardableUndoUnit( );
   public void DiscardUndoUnit(object discardableUndoUnit);
   public void EnableUndo(bool enable);
   public void UpdateSelection( );
// Events
   public event EventHandler LoadComplete;
}