C#:webBrowser1控件通过TagName,Name查找元素(没有ID时)

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//防止页面多次刷新页面执行
            if (num == 1)
            {
                string GetUserName = System.Configuration.ConfigurationSettings.AppSettings["Y2000UserName"].ToString();
                string GetUserPassword = System.Configuration.ConfigurationSettings.AppSettings["Y2000UserPassword"].ToString();
                int a = 1;
                int all = webBrowser1.Document.Body.All.Count;

                for (int i = 0; i < all; i++)
                {
                    HtmlElement GetElement = webBrowser1.Document.All[i];
                    //取到包含input标签的元素
                    if (GetElement.TagName.ToUpper().ToString() == "INPUT")
                    {
                        //根据input的Name属性，找到该元素并赋值：给用户名输入框赋值
                        if (GetElement.Name.ToString() == "UserName")
                        {
                            webBrowser1.Document.All[i].SetAttribute("value", GetUserName);
                        }
                        //根据input的Name属性，找到该元素并赋值：给密码输入框赋值
                        if (GetElement.Name.ToString() == "Passwd")
                        {
                            webBrowser1.Document.All[i].SetAttribute("value", GetUserPassword);
                        }
                    }

                    //根据input的Name属性，找到提交按钮并执行动作
                    if (GetElement.Name.ToString() == "Submit")
                    {
                        //过滤点击页面中相同"name=Submit"的元素
                        if (a == 1)
                        {
                            webBrowser1.Document.All[i].InvokeMember("click");
                        }
                        a++;
                    }
                }
                num++;
            }

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