单击按钮不会更改数据库c#中的任何内容

using System;
using System.Data.SqlClient;
using System.Windows.Forms;

namespace DatabaseExample
{
    public partial class MainForm : Form
    {
        private SqlConnection connection;
        private SqlCommand command;

        public MainForm()
        {
            InitializeComponent();
            InitializeDatabaseConnection();
        }

        private void InitializeDatabaseConnection()
        {
            string connectionString = "Data Source=YourServerName;Initial Catalog=YourDatabaseName;User ID=YourUsername;Password=YourPassword";
            connection = new SqlConnection(connectionString);
            command = new SqlCommand();
            command.Connection = connection;
        }

        private void btnUpdate_Click(object sender, EventArgs e)
        {
            try
            {
                connection.Open();
                string updateQuery = "UPDATE YourTableName SET YourColumnName = 'NewValue' WHERE YourCondition";
                command.CommandText = updateQuery;
                command.ExecuteNonQuery();
                MessageBox.Show("Database updated successfully!");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error updating database: " + ex.Message);
            }
            finally
            {
                connection.Close();
            }
        }
    }
}