问自动登录到站点并单击按钮

EN

internal void LoginToSite()
        {
            WebBrowser.Navigate("some site login Page");
            _Processing = true;
            var username = ConfigurationManager.AppSettings["username"];
            var password = ConfigurationManager.AppSettings["password"];
            while (_Processing)
            {
                Application.DoEvents();
                if (WebBrowser.ReadyState == WebBrowserReadyState.Complete || WebBrowser.ReadyState == WebBrowserReadyState.Interactive)
                {
                    var htmlDocument = this.WebBrowser.Document;
                    if (htmlDocument != null)
                    {
                        foreach (HtmlElement tag in htmlDocument.GetElementsByTagName("input"))
                        {
                            switch (tag.Name)
                            {
                                case "username":
                                    tag.InnerText = username;
                                    break;
                                case "password":
                                    tag.InnerText = password;
                                    break;
                                case "cmdlogin":
                                    tag.RaiseEvent("onclick");
                                    tag.InvokeMember("Click");
                                    break;
                            }

                        }
                    }
                    _Processing = false;
                }
            }
        }