通过A站点写一定的代码去登录B站点，我可以通过post去成功登录B站点，问题是我想登录成功后直接将主动权交给B站点，也就是说模拟B站点的登录，登录成功后的操作交给B站点（如转向main.aspx），现在是不知道如何转向登陆成功以后的主界面

 string Password = "000000";
            ASCIIEncoding encoding = new ASCIIEncoding();
            string postData = "txtUserName=" + UserName;//比如网页上输入框的名字为uname
            postData += ("&txtPwd=" + Password + "&action=submit&http_referer=");//密码输入框名字为password
            byte[] data = encoding.GetBytes(postData);
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("http://B/login.aspx");//登陆页地址
            myRequest.Method = "POST";
            myRequest.ContentType = "application/x-www-form-urlencoded";
            myRequest.ContentLength = data.Length;
            myRequest.KeepAlive = true;
            myRequest.AllowAutoRedirect = true;
            myRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)";
            Stream newStream = myRequest.GetRequestStream();
            newStream.Write(data, 0, data.Length);
            newStream.Close();

            myRequest.CookieContainer = cc;
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
            myResponse.Cookies = myRequest.CookieContainer.GetCookies(myRequest.RequestUri);
    

            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
            string content = reader.ReadToEnd();//此处已经登陆成功返回的是第三方的主页面main.aspx的html，不能直接输出到页面，因为资源文件是属于B站点