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string usname = null;
            string psw = null;
            string role = "";
            string conString = "Provider=Microsoft.Jet.OleDb.4.0;Data Source=aa.mdb";
            OleDbConnection conn = new OleDbConnection(conString);
            conn.Open();
            OleDbCommand cmd = new OleDbCommand();
            cmd.Connection = conn;
            cmd.CommandText = "select username,[password],role from [user]";
            OleDbDataReader rdr = cmd.ExecuteReader();
            while (rdr.Read())
            {
                usname = rdr["username"].ToString();
                psw = rdr["password"].ToString();