C#实例化一个firefox模型问题

我想知道C#可以通过： SHDocVw.InternetExplorer IE = new InternetExplorer();实例化一个IE模型，然后可以抓取页面元素，模拟IE的各种行为，以下是模拟登陆代码（请不要说通过post,post返回的cookie是临时cookie）
但是C#可不可以实例化一个firefox或者chrome模型，然后像下面代码一样在firefox浏览器中模拟以下行为呢？

 SHDocVw.InternetExplorer IE = new InternetExplorer();
                        IE.Visible = true;
                        string URL = "";
                        object nullArg = null;
                        IE.Navigate(URL, ref nullArg, ref nullArg, ref nullArg, ref nullArg);
                        while (IE.Busy || IE.ReadyState != tagREADYSTATE.READYSTATE_COMPLETE) Thread.Sleep(1000);

                        //得到IE的文档对象模型
                        mshtml.IHTMLDocument2 DOM = (mshtml.IHTMLDocument2)IE.Document;
                        //声明用户
                        mshtml.IHTMLInputTextElement txtUserName = (mshtml.IHTMLInputTextElement)DOM.all.item("id", null);
                        txtUserName.value = id;
                        //密码
                        mshtml.IHTMLInputTextElement txtUserPwd = (mshtml.IHTMLInputTextElement)DOM.all.item("pw", null);
                        txtUserPwd.value = pwd;
                        //登录
                        mshtml.HTMLInputElement btnLogin = (mshtml.HTMLInputElement)DOM.all.item("login_btn", 0);
                        btnLogin.click();
                        System.Threading.Thread.Sleep(1000);

谢谢大家！！！

http://download.csdn.net/download/xiaoyunaa/3411907