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private void Open()
    {
        // ´ò¿ªÊý¾Ý¿âÁ¬½Ó
        if (con == null)
        {
            con = new SqlConnection("Data

Source=localhost;DataBase=db_SIS;User

ID=jay;PWD=jaydigital");
        }
        if (con.State ==

System.Data.ConnectionState.Closed)
            con.Open();

    }


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ÐÐ 36:        }
ÐÐ 37:        if (con.State == System.Data.ConnectionState.Closed)
ÐÐ 38:            con.Open();
ÐÐ 39:
ÐÐ 40:    }


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