/// <summary>
        /// delete InvestorGroupConfig by investorGroupID
        /// </summary>
        /// <param name="id"></param>
        /// <param name="connection">opened sqlconnection</param>
        /// <returns></returns>
        internal bool DFDeleteByGroupID(int id,SqlConnection connection,SqlTransaction trans)
        {
            DSTableAdapters.InvestorGroupConfigTableAdapter adap = new DSTableAdapters.InvestorGroupConfigTableAdapter();
            adap.Connection = connection;
            adap.Transaction = trans;
            adap.DeleteInvestorGroupConfigByInvestorGroupID(id);

            return true;
        }