c# HttpWebRequest

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;

namespace WebManager
{
    class WebConstants
    {
        public static readonly string ContentType = "application/x-www-form-urlencoded";
        public static readonly string UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.63 Safari/535.7";
        public static readonly string Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
    }

    public class WebSession
    {
        private string main_site;
        private CookieContainer cook;

        public string user_agent;
        public string referer;

        public WebSession()
        {
            cook = new CookieContainer();
        }

        public WebSession(string site)
            : this()
        {
            main_site = site;
            user_agent = WebConstants.UserAgent;
            referer = "";
        }

        public string SendRequest(string path, string method, string options)
        {
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(main_site + path);
           
            req.Method = method;
            req.CookieContainer = cook;
            req.UserAgent = user_agent;

            if (method == "POST")
            {
                req.ContentType = WebConstants.ContentType;
                req.ContentLength = options.Length;

                Console.WriteLine(options);

                StreamWriter sw = new StreamWriter(req.GetRequestStream());
                sw.Write(options);
                sw.Close();
            }

            HttpWebResponse resp = (HttpWebResponse) req.GetResponse();

            Console.WriteLine(req.HaveResponse);

            StreamReader sr = new StreamReader(resp.GetResponseStream(), Encoding.GetEncoding(1251));
            string result = sr.ReadToEnd();
            sr.Close();

            cook = req.CookieContainer;

            return result;
        }
    }
}

namespace Debug
{
    class Program
    {
        static void Main(string[] args)
        {
            WebSession sess = new WebSession("http://heroeswm.ru");
            string res = sess.SendRequest("", "GET", "");

            Console.WriteLine(res);
        }
    }
}