Represents a table lookup for active measurements.
        internal DataSourceLookupCache(DataSet dataSet)
        {
            DataSet           = dataSet;
            dataSet.Disposed += DataSet_Disposed;

            ActiveMeasurements = new ActiveMeasurementsTableLookup(dataSet);
        }
        internal DataSourceLookupCache(DataSet dataSet)
        {
            DataSet = dataSet;
            dataSet.Disposed += DataSet_Disposed;

            ActiveMeasurements = new ActiveMeasurementsTableLookup(dataSet);
        }