HtmlElement name = webBrowser1.Document.GetElementById("ctl00$content$loginname");
if (name != null)
name.SetAttribute("value", User);
HtmlElement pass = webBrowser1.Document.GetElementById("ctl00$content$pwd");
if (pass != null)
pass.SetAttribute("value", Password);
HtmlElement login = webBrowser1.Document.GetElementById("ctl00_content_summit");
if (login != null)
login.InvokeMember("click");