httpwebrequest模拟人人网登陆POST超时的问题



static string HostUrl = "http://www.renren.com/SysHome.do";//xiaonei主页

        static string LoginUrl = "http://www.renren.com/PLogin.do";//login主页

        static CookieContainer cookecn = new CookieContainer();

        static string email = "用户名";

        static string pwd = "密码";

        static string fisrtgethost = string.Empty;

        static string Cookiesstr = string.Empty;

HttpWebRequest request = null;

            HttpWebResponse response = null;

            try

            {

                request = (HttpWebRequest)WebRequest.Create(LoginUrl);

                request.Method = "POST";

                request.Referer = "http://www.renren.com/SysHome.do";

                request.ContentType = "application/x-www-form-urlencoded";

                request.AllowAutoRedirect = false;

                byte[] postdatabtyes = Encoding.UTF8.GetBytes(postdata);

                request.ContentLength = postdatabtyes.Length;

                request.CookieContainer = cookecn;

                request.KeepAlive = true;

                Stream requeststream = request.GetRequestStream();

                requeststream.Write(postdatabtyes, 0, postdatabtyes.Length);

                requeststream.Close();

                response = (HttpWebResponse)request.GetResponse();

......

为什么执行到response = (HttpWebResponse)request.GetResponse();这一步就超时呢？ --------------------编程问答--------------------
request = (HttpWebRequest)WebRequest.Create(LoginUrl);request.TimeOut..
                request.Method = "POST";
                request.Referer = "http://www.renren.com/SysHome.do";
                request.ContentType = "application/x-www-form-urlencoded";
                request.AllowAutoRedirect = false;
                byte[] postdatabtyes = Encoding.UTF8.GetBytes(postdata);
                request.ContentLength = postdatabtyes.Length;
                request.CookieContainer = cookecn;
                request.KeepAlive = true;
                Stream requeststream = request.GetRequestStream();
                requeststream.Write(postdatabtyes, 0, postdatabtyes.Length);
                requeststream.Close();
--------------------编程问答--------------------

引用 1 楼 wuyq11 的回复:

request = (HttpWebRequest)WebRequest.Create(LoginUrl);request.TimeOut..
                request.Method = "POST";
                request.Referer = "http://www.renren.com/SysHome.do";
              ……

有什么区别么

补充：.NET技术 ,  C#