namespace { public partial class Form1 : Form { public Form1() { InitializeComponent(); this.webBrowser1.Navigate("http://xxx/login.aspx"); } private void Form1_Load(object sender, EventArgs e) { } private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { HtmlElement tbUserid = this.webBrowser1.Document.GetElementById("userid"); HtmlElement tbpwdid = this.webBrowser1.Document.GetElementById("passwordid"); HtmlElement tbsubmit = this.webBrowser1.Document.GetElementById("submitid"); if (tbUserid == null || tbpwdid == null || tbsubmit == null) { return; } tbUserid.SetAttribute("value", "用户名"); tbpwdid.SetAttribute("value", "密码"); tbsubmit.InvokeMember("click"); } } }