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);
                        }
                    }                    

                }
            }             

        }
    }