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sqlstr = "select * from Balancelist bl where card_no in(select ca.card_no from CurrentAcc ca join DebitCard dc on ca.father_no='" + cardno + "' union select ra.card_no from RegularAcc ra join DebitCard dc on ra.card_no='" + cardno + "' union select fa.card_no from FinancialAcc fa join DebitCard dc on fa.card_no='" + cardno + "')";
this.OpenCon();
OleDbDataAdapter adapter = new OleDbDataAdapter(sqlstr, sqlcon);
DataSet ds = new DataSet();
adapter.Fill(ds, "BalanceList");
this.CloseCon();