//
 public CollectionHelper(string sExchangeConnectionString)
 {
     _collectionDataContext = new CollectionDataContext(new SqlConnection(CommonUtilities.SiteConnectionString(sExchangeConnectionString)));
     exchangeConnectionString = sExchangeConnectionString;
 }
        public CollectionHelper()
        {
            _collectionDataContext = new CollectionDataContext(new SqlConnection(CommonUtilities.ExchangeConnectionString));
            exchangeConnectionString = CommonUtilities.ExchangeConnectionString;

        }