winform登陆界面连接mysql

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

namespace WinformLoginDemo
{
    public partial class LoginForm : Form
    {
        private MySqlConnection connection;

        public LoginForm()
        {
            InitializeComponent();
        }

        private void btnLogin_Click(object sender, EventArgs e)
        {
            string connectionString = "Server=localhost;Database=mydatabase;Uid=myusername;Pwd=mypassword;";
            connection = new MySqlConnection(connectionString);

            try
            {
                connection.Open();
                string query = "SELECT * FROM users WHERE username = @username AND password = @password";
                MySqlCommand command = new MySqlCommand(query, connection);
                command.Parameters.AddWithValue("@username", txtUsername.Text);
                command.Parameters.AddWithValue("@password", txtPassword.Text);

                MySqlDataReader reader = command.ExecuteReader();
                if (reader.Read())
                {
                    MessageBox.Show("登录成功！");
                    // 进入主界面或其他逻辑
                }
                else
                {
                    MessageBox.Show("用户名或密码错误！");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("连接数据库时发生错误：" + ex.Message);
            }
            finally
            {
                connection.Close();
            }
        }
    }
}