public List<object> get()
        {
            List<object> retColl = new List<object>();

            // Create DBHelper's Instance
            DBHelper dbhelper = new DBHelper();
            // Get query string
            string insertstr = buildStringForQuery();
            // Get from DB
            OleDbDataReader dr = dbhelper.ExecuteQuery(insertstr);
            // Get rows and convert them to user collection
            if (dr.HasRows)
            {
                while (dr.Read())
                {
                    retColl.Add(convertFromReader(dr));
                }
            }
            // Close DB Helper
            dbhelper.close();
            return retColl;
        }