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public class Event
    {
        private List<Fotos> fotoFiles;

        public List<Fotos> FotoFiles
        {
            get
            {
                if (fotoFiles == null)
                {
                    fotoFiles = new List<Fotos>();
                    this.fillFotoFiles();
                }
                return fotoFiles;
            }
            set { fotoFiles = value; }
        }