====== Lazy initialization ======

<code csharp>
        static readonly object padlock = new object();
        private DataSet _dataSet;

        public DataSet DataSet
        {
            get
            {
                lock (padlock)
                {
                    if (_dataSet == null)
                    {
                        _dataSet = new ...;
                    }
                }
                return _dataSet;
            }
        }
</code>