[DllImport("wininet.dll",SetLastError = true)]
        private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);

        private void timer_Tick(object sender, EventArgs e)
        {
            InternetSetOption(IntPtr.Zero,42,IntPtr.Zero,0);
            if (this.webBrowser.Document != null)
            {
                this.webBrowser.Document.Cookie.Remove(0, this.webBrowser.Document.Cookie.Count() - 1);
            }
            string[] cookies = System.IO.Directory.GetFiles(Environment.GetFolderPath(Environment.SpecialFolder.Cookies));
            foreach (string currentFile in cookies)
            {
                try
                {
                    System.IO.File.Delete(currentFile);
                }
                catch { }
            }
            this.webBrowser.Navigate(SysInfo.WEBURL);
        }

                    this.webBrowser.Document.GetElementById("user").SetAttribute("value", "user");
                    this.webBrowser.Document.GetElementById("password").SetAttribute("value", "password");
                    this.webBrowser.Document.InvokeScript("SetCookie");
                    for (int i = 0; i < 10; i++)//等待1秒，进行登录
                    {
                        Thread.Sleep(100);
                    }
                    HtmlElement btnLogin = this.webBrowser.Document.GetElementById("login");
                    btnLogin.InvokeMember("Click");
                    for (int i = 0; i < 5; i++)//等待0.5秒，进行跳转
                    {
                        Thread.Sleep(100);
                    }
                    this.webBrowser.Navigate(SysInfo.DATAURL);

HtmlElement div = this.webBrowser.Document.GetElementById("style1");