class Program

    {

        static void Main(string[] args)

        {

            string connStr = ConfigurationManager.ConnectionStrings["sql"].ConnectionString;

            using (MySqlConnection conn = new MySqlConnection(connStr))

            {

                string sql = "select * from sys_user ";

                conn.Open();

                using (MySqlCommand cmd = new MySqlCommand(sql, conn))

                {

                    using (MySqlDataReader dataReader = cmd.ExecuteReader())

                    {

                        while (dataReader.Read())

                        {

                            string obj = (string)dataReader[1];

                            Console.WriteLine(obj);

                        }

                    }                    

                }

            }             

        }

    }