Сделать запрос к серверу и получить ответ

using System.IO;
using System.Net;
using System.Text;
 
namespace my
{
    public class HtmlDownloadHelper
    {
        public static string DownloadHtml(string uri)
        {
           return DownloadHtml(uri, Encoding.UTF8);
        }
        public static string DownloadHtml(string uri, Encoding encoding)
        {
            var request = WebRequest.Create(uri) as HttpWebRequest;
            request.KeepAlive = true;
            request.UserAgent="Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.116 Safari/537.36";
            request.Accept="text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            request.Headers.Set("Accept-Language","ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3");
            request.Headers.Set("Accept-Charset", "windows-1251,utf-8;q=0.7,*;q=0.7");
            var response = request.GetResponse() as HttpWebResponse;
            var sr = new StreamReader(response.GetResponseStream(), encoding);
            sr.ReadLine();
            var html = sr.ReadToEnd();
            return html;
        }
    }
}

var Request = new { Login = login, Passw = *******, ................ }

var аnswer= DownloadHtml(string.Format(@"https:/www.i.ua/get?login={0}&password{1}",login,password))