Inheritance: INotifyPropertyChanging, INotifyPropertyChanged
        /// <summary>
        /// function to add a dictionary to the database
        /// </summary>
        /// <param name="type">The name of the dictionary</param>
        /// <param name="Slide_URL">Where the Silde is store</param>
        public void addDictionary(string type, string Slide_URL)
        {
            using (PlanetariumDataContext db = new PlanetariumDataContext())
            {

                Dictionary dictionary = new Dictionary { Type = type, Slide_URL = Slide_URL };
                db.Dictionaries.InsertOnSubmit(dictionary);
                db.SubmitChanges();
            }
        }
 partial void UpdateDictionary(Dictionary instance);
 partial void DeleteDictionary(Dictionary instance);
 partial void InsertDictionary(Dictionary instance);