winform调用javascript

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<html>     <head>          <title></title>          <script type="text/javascript">          function ShowMessage(message)          {               alert(message);          }          function ShowWinFormsMessage() {               var msg = document.getElementById('txtMessage').value;               return window.external.ShowMessage(msg);          }          </script>     </head>     <body>          <input type="text" id="txtMessage" />          <input type="button" value="Show Message" onclick="ShowWinFormsMessage()" />     </body></html>

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;namespace WebBrowserJavaScriptExample{    public partial class frmMain : Form    {        public frmMain()        {            InitializeComponent();            webBrowser1.ObjectForScripting = new ScriptManager(this);        }        private void btnShowMessage_Click(object sender, EventArgs e)        {            object[] o = new object[1];            o[0]=txtMessage.Text;            object result = this.webBrowser1.Document.InvokeScript("ShowMessage", o);        }        private void frmMain_Load(object sender, EventArgs e)        {            this.webBrowser1.Navigate(@"E:\Projects\2010\WebBrowserJavaScriptExample\WebBrowserJavaScriptExample\TestPage.htm");        }        [ComVisible(true)]        public class ScriptManager        {            frmMain _form;            public ScriptManager(frmMain form)            {                _form = form;            }            public void ShowMessage(object obj)            {                MessageBox.Show(obj.ToString());            }        }    }}