this.DBContext.Notes.Where(n => n.ID == selectedNote.ID).Load();
this.notesBox.DataContext = this.DBContext.Notes.Local;

this.DBContext.Local.Notes.Remove(selectedNote);
this.notesBox.DataContext = this.DBContext.Notes.Local;

var collection = new ObservableCollection<Note>(this.DBContext.Notes.Where(n => n.ID == selectedNote.ID));
this.notesBox.DataContext = collection;