public MovieDictionary()
        {
            //creating dictionary and adding some initial data to it
            movieTable = new SortedDictionary<int, Movie>();

            Movie movie1 = new Movie(2016, "Spotlight", "Tom McCarthy");
            Movie movie2 = new Movie(2015, "Birdman", " Alejandro González Iñárritu");
            Movie movie3 = new Movie(2014, "12 Years A Slave", "Steve McQuenn");
            Movie movie4 = new Movie(2013, "Argo", "Ben Affleck");
            Movie movie5 = new Movie(2012, "The Artist", "Michel Hazanavicius");

            movieTable.Add(movie1.Year, movie1);
            movieTable.Add(movie2.Year, movie2);
            movieTable.Add(movie3.Year, movie3);
            movieTable.Add(movie4.Year, movie4);
            movieTable.Add(movie5.Year, movie5);
        }
        /// <summary>
        /// Add a new movie to the database
        /// </summary>
        /// <param name="year">Movie year</param>
        /// <param name="title">Movie title</param>
        /// <param name="Director">Movie director</param>
        /// <param name="feedback">Feedback about success of adding movie</param>
        /// <returns>True if addition was successful</returns>
        public Boolean AddMovie(String year, String title, String director, out String feedback)
        {
            int key;
            //TODO Place return false in each check so that user only gets one error message?
            //Check year is valid
            checkYear(year, out key, out feedback);

            //Check that there isn't already a movie for this year!
            if (movieTable.ContainsKey(key))
            {
                feedback += " A movie for " + key + " already exists.";
            }

            //Check a title has been entered
            if (title.Length == 0)
            {
                feedback += " Please enter a title.";
            }

            //Check a director has been entered
            if (director.Length == 0)
            {
                feedback += " Please enter a director.";
            }

            //Check all data is valid
            if (feedback != "")
            {
                return false;
            }

            //Create new movie and add to database now that we know that data is all okay
            Movie movie = new Movie(key, title, director);
            movieTable.Add(key, movie);

            feedback = "Movie was added successfully";
            return true;
        }
 //adds a movie to the dictionary
 public void addMovie(int year, string title, string director)
 {
     try
     {
         //if the year is either to high or too small it will show an error message
         if ((year < 2020) && (year > 1900))
         {
             //if there is no title it will show an error message
             if (title != "")
             {
                 //if there is no director it will show an error message
                 if (director != "")
                 {
                     Movie movie = new Movie(year, title, director);
                     movieTable.Add(movie.Year, movie);
                 }
                 else
                 {
                     MessageBox.Show("Please enter a Director");
                 }
             }
             else
             {
                 MessageBox.Show("Please enter a Title");
             }
         }
         else
         {
             MessageBox.Show("That is not a valid Year");
         }
     }
     catch (ArgumentException ex)
     {
         MessageBox.Show("There is already a movie from that Year");
     }
 }