我从webBrowser1.DocumentText得到内容放到textBox.txt中不能显示中文汉字.

// Navigates to the URL in the address box when 
        // the ENTER key is pressed while the ToolStripTextBox has focus.
        private void toolStripTextBox1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                Navigate(toolStripTextBox1.Text);
            }
        }        // Navigates to the URL in the address box when 
        // the Go button is clicked.
        private void goButton_Click(object sender, EventArgs e)
        {
            
            Navigate(toolStripTextBox1.Text);
            
        }        // Navigates to the given URL if it is valid.
        private void Navigate(String address)
        {
            if (String.IsNullOrEmpty(address)) return;
            if (address.Equals("about:blank")) return;
            if (!address.StartsWith("http://")) address = "http://" + address;
            try
            {
                webBrowser1.Navigate(new Uri(address));
              
            }
            catch (System.UriFormatException)
            {
                return;
            }
        }        // Updates the URL in TextBoxAddress upon navigation.
        private void webBrowser1_Navigated(object sender,
            WebBrowserNavigatedEventArgs e)
        {
            toolStripTextBox1.Text = webBrowser1.Url.ToString();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            this.toolStripTextBox1.Text = "www.jlthjy.com";
        }        private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            textBox1.Text = webBrowser1.DocumentText;
        }