string ConnectionString = "Data Source=数据库名;User Id=用户名;Password=密码;Integrated Security=no;";

        OracleConnection conn=new  OracleConnection(ConnectionString);

        conn.Open();

        OracleCommand cmd = new OracleCommand("select * from FY", conn);

        OracleDataAdapter oda = new OracleDataAdapter(); 

        oda.SelectCommand = cmd;

          DataSet ds = new DataSet();

          oda.Fill(ds);

          gridControl1.DataSource = ds.Tables[0].DefaultView;

           conn.Close();

      string ConnectionString = "DataSource=数据库名称;User Id=数据库登陆名;Password=密码;Integrated Security=no;";

       OracleConnection conn=new OracleConnection(ConnectionString);

       conn.Open();

       string str = "SQL修改语句'";

      //当不传递conn时，会提示连接没有打开

       OracleCommand cmd1 = newOracleCommand(str,conn);

       //ExecuteNonQuery()对于 Update,Insert,Delete 语句执行成功是返回值为该命令所影响的行数

       int result=cmd1.ExecuteNonQuery();