private ISingleDataSource<double> CreateDataSource()
        {
            var realDataSource = new FakeSingleDataSource<double>( "dummy" );
            realDataSource.Data[ "a" ] = 1;
            realDataSource.Data[ "b" ] = 2;

            return new CachingSingleDataSource<double>( realDataSource );
        }
        private ISingleDataSource <double> CreateDataSource()
        {
            var realDataSource = new FakeSingleDataSource <double>("dummy");

            realDataSource.Data["a"] = 1;
            realDataSource.Data["b"] = 2;

            return(new CachingSingleDataSource <double>(realDataSource));
        }