Indiefreaks.Xna.Sessions.SessionProperties.this C# (CSharp) Method

        public int? this[int index]
        {
            get
            {
                if ((index < 0 || index >= 8))
                    throw new ArgumentOutOfRangeException("index");

                return _data[index];
            }
            set
            {
                if ((index < 0 || index >= 9))
                    throw new ArgumentOutOfRangeException("index");

                if (PropertyChanging != null)
                    PropertyChanging(index, value);

                _data[index] = value;
            }
        }