WebBrowser 提交表单的有关问题

WebBrowser 提交表单的问题
网页地址: www.cqjg.gov.cn/DriverFind.html

我要通软件实现查询功能,填写表单功能实现了,实现点击"查询"没有响应,不知道哪里有错误

代码如下:

C# code

        private void btnSearch_Click(object sender, EventArgs e)        {            try            {                wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);                wb.Navigate("www.cqjg.gov.cn/DriverFind.html");            }            catch (Exception ex)            {                MessageBox.Show(ex.Message);            }                    }        private void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)        {            #region 参数设置            HtmlElement btnSubmit = wb.Document.All["formthree"]; //获取登录对应元素            HtmlElement tbUserid = wb.Document.All["txtDname"];     //获取用户名对应元素            HtmlElement tbStyle = wb.Document.All["txtCertificate"];     //获取证件号对应元素            tbUserid.SetAttribute("value", "宋世");     //给用户名赋值            tbStyle.SetAttribute("value", "1234567");    //给密码赋值            btnSubmit.InvokeMember("submit"); //模拟点击登录按钮            #endregion        }

C# code

private void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)        {           if (webBrowser1.ReadyState == WebBrowserReadyState.Complete)            {            #region 参数设置            HtmlElement btnSubmit = wb.Document.All["formthree"]; //获取登录对应元素            HtmlElement tbUserid = wb.Document.All["txtDname"];     //获取用户名对应元素            HtmlElement tbStyle = wb.Document.All["txtCertificate"];     //获取证件号对应元素            tbUserid.SetAttribute("value", "宋世");     //给用户名赋值            tbStyle.SetAttribute("value", "1234567");    //给密码赋值            btnSubmit.InvokeMember("submit"); //模拟点击登录按钮            #endregion           }        }