C# 模拟用户登录

/// <summary>
 /// 登录网站并获取Cookies
 /// </summary>
 /// <returns>成功登录的Cookie信息</returns>
public static CookieContainer Get_Login()
 {
            CookieContainer cc = new CookieContainer();
            string FormURL=http://www.fy681.com/login.aspx;                //处理表单的绝对URL地址
            string FormData = "username=dahai163&passwd=123";    //表单需要提交的参数，注意改为你已注册的信息。
            ASCIIEncoding encoding = new ASCIIEncoding();
            byte[] data = encoding.GetBytes(FormData);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(FormURL);
            request.Method = "POST";    //数据提交方式
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = data.Length;
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)";
            //模拟一个UserAgent
            Stream newStream = request.GetRequestStream();
            newStream.Write(data, 0, data.Length);

            newStream.Close();
                   
            request.CookieContainer = cc;
                   
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            cc.Add(response.Cookies);
            Stream stream = response.GetResponseStream();
            string WebContent = new StreamReader(stream, System.Text.Encoding.Default).ReadToEnd();
            return cc;
}