wpf连接mysql错误

Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;

GRANT ALL PRIVILEGES ON mydatabase.* TO 'myusername'@'localhost';
FLUSH PRIVILEGES;

sudo systemctl status mysql

sudo systemctl start mysql

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

namespace WPFMySQLExample
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            ConnectToMySQL();
        }

        private void ConnectToMySQL()
        {
            string connectionString = "Server=localhost;Database=mydatabase;Uid=myusername;Pwd=mypassword;";
            MySqlConnection connection = new MySqlConnection(connectionString);

            try
            {
                connection.Open();
                string query = "SELECT * FROM mytable";
                MySqlCommand command = new MySqlCommand(query, connection);
                MySqlDataReader reader = command.ExecuteReader();

                while (reader.Read())
                {
                    Console.WriteLine(reader["columnName"].ToString());
                }

                reader.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error: " + ex.Message);
            }
            finally
            {
                connection.Close();
            }
        }
    }
}