public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
            webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
            webBrowser1.Navigate("about:blank ");
        }

        void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            if (string.IsNullOrEmpty(webBrowser1.Document.Body.InnerHtml))
            {
                webBrowser1.Document.Body.InnerHtml = "<a href='http://baidu.com'>天津</a>";
            }
        }
    }