C# MySql Dapper

using System.Text.Json;
using MySql.Data.MySqlClient;
using Dapper;
using System.IO;

 static void MySQLDemo()
        {
            string selectSQL = "select * from salesorderdetail;";
            string connString = "Server=localhost;Port=3306;Database=mydb;Uid=root;Pwd=Root;";
            using (MySqlConnection conn=new MySqlConnection(connString))
            {
                conn.Open();
                var result=conn.Query<dynamic>(selectSQL);
                string jsonValue = JsonSerializer.Serialize(result);
                StreamWriterContent("DapperJson2.txt", jsonValue);
            }
        }

        static void StreamWriterContent(string filePath,string content)
        {
            using (StreamWriter msgWriter = new StreamWriter(filePath, true, Encoding.UTF8))
            {
                msgWriter.WriteLine(content);
            }
        }