webBrowser1.Document.GetElementById("allow").InvokeMember("click");

 foreach (HtmlElement a in webBrowser1.Document.All)
            {
                    if (a.GetAttribute("class") == "textual link")
                    {
                        a.InvokeMember("click");
                    }
                
            }

foreach (HtmlElement a in webBrowser1.Document.GetElementsByTagName("input"))
            {
                //MessageBox.Show(a.InnerText);
                if (a.GetAttribute("value") == "Выйти")
                    {
                        MessageBox.Show("3");
                        a.InvokeMember("click");
                    }
                
            }