C# web 获取服务端cookie

CookieContainer cookies = new CookieContainer();
            string url = "http://120.24.56.48:8889/api/auth/login?username=13590372650&password=wjkj110";
            HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);
            myHttpWebRequest.Timeout = 20 * 1000; //连接超时  
            myHttpWebRequest.Accept = "*/*";
            myHttpWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0;)";
            myHttpWebRequest.CookieContainer = new CookieContainer(); //暂存到新实例</span>  
            myHttpWebRequest.GetResponse().Close();
            cookies = myHttpWebRequest.CookieContainer; //保存cookies</span>  
            string cookiesstr = myHttpWebRequest.CookieContainer.GetCookieHeader(myHttpWebRequest.RequestUri); //把cookies转换成字符串

url = "http://120.24.56.48:8889/api/auth/login?username=13590372650&password=wjkj110";
            myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);
            myHttpWebRequest.Timeout = 20 * 1000; //连接超时  
            myHttpWebRequest.Accept = "*/*";
            myHttpWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0;)";
            myHttpWebRequest.CookieContainer = cookies; //使用已经保存的cookies 方法一</span>  
            //myHttpWebRequest.Headers.Add("Cookie", cookiesstr); //使用已经保存的cookies 方法二  
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
            Stream stream = myHttpWebResponse.GetResponseStream();
            stream.ReadTimeout = 15 * 1000; //读取超时  
            StreamReader sr = new StreamReader(stream, Encoding.GetEncoding("utf-8"));
            string strWebData = sr.ReadToEnd();

string richTextBox1 = cookiesstr + "\r\n\r\n" + strWebData;