vs调用mysql

using System;
using System.Data;
using MySql.Data.MySqlClient;

class Program
{
    static void Main()
    {
        string connectionString = "Server=localhost;Database=testdb;Uid=root;Pwd=password;";
        using (MySqlConnection connection = new MySqlConnection(connectionString))
        {
            try
            {
                connection.Open();
                string sql = "SELECT * FROM users";
                using (MySqlCommand command = new MySqlCommand(sql, connection))
                {
                    using (MySqlDataReader reader = command.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            Console.WriteLine(reader["username"]);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error: " + ex.Message);
            }
        }
    }
}