发送带有认证信息的HTTP请求并取回响应

        public static void Credential() 
        {
            string url = "http://server/path/webform.aspx";
            WebRequest wreq = WebRequest.Create(url);
            //设置信息，创建对象
            string userId="CalvinR";
            string password="123";
            string domain = "DomainName";
            NetworkCredential nc = new NetworkCredential(userId,password,domain);
            wreq.Credentials = nc;
            Console.WriteLine("Sending authenticated request to"+url);
            //读取、响应
            WebResponse wres = wreq.GetResponse();
            Stream st = wres.GetResponseStream();
            StreamReader sr = new StreamReader(st);
            string res = sr.ReadToEnd();

            st.Close();
            sr.Close();

            Console.WriteLine("HTTP response is ");
            Console.WriteLine(res);
        }