如何在WebBrowser控件中获取页面标题？

using System;
using System.Windows.Forms;

namespace GetPageTitle
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            webBrowser1.DocumentCompleted += WebBrowser1_DocumentCompleted;
        }

        private void WebBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            Text = webBrowser1.DocumentTitle;
        }
    }
}