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WebBrowser wb;
HtmlDocument doc= wb.Document.GetElementById("login_frame").Document;
HtmlElement name=doc.GetElementById("username");
name.SetAttribute("value", "123");
HtmlElement pwd = doc.GetElementById("userpwd");
pwd.SetAttribute("value", "123");
doc.GetElementById("submitBtn").InvokeMember("click");
webBrowser.Navigate(JavaScriptCode);