Post запрос donationalerts

using System;
using System.Text;
using System.Net;
using System.IO;
 
namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            string Data = "data=emotes%3D%26name%3D100%26amount%3D200%26currency%3DRUB%26comment%3D300&form=unitpay";
            Console.WriteLine(POST("http://www.donationalerts.ru/u/spectre_by", Data));
            Console.ReadLine();
        }
 
        private static string POST(string Url, string Data)
        {
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(Url);
            req.Method = "POST";
            req.Timeout = 100000;
            req.CookieContainer = new CookieContainer();
            req.ContentType = "application/x-www-form-urlencoded";
            byte[] sentData = Encoding.GetEncoding(1251).GetBytes(Data);
            req.ContentLength = sentData.Length;
            Stream sendStream = req.GetRequestStream();
            sendStream.Write(sentData, 0, sentData.Length);
            sendStream.Close();
            WebResponse res = req.GetResponse();
            Stream ReceiveStream = res.GetResponseStream();
            StreamReader sr = new StreamReader(ReceiveStream, Encoding.UTF8);
 
            Char[] read = new Char[256];
            int count = sr.Read(read, 0, 256);
            string Out = String.Empty;
            while (count > 0)
            {
                String str = new String(read, 0, count);
                Out += str;
                count = sr.Read(read, 0, 256);
            }
            return Out;
        }
    }
}

            req.CookieContainer = new CookieContainer();
            req.CookieContainer.Add(new Cookie("_ga", "GA1.2.307362799.1462432385", "/", "www.donationalerts.ru"));
            req.CookieContainer.Add(new Cookie("donation_name", "100", "/", "www.donationalerts.ru"));
            req.CookieContainer.Add(new Cookie("r00tCookie", "a29009b872a04b41e30f43be1e5cbced", "/", "www.donationalerts.ru"));
            req.CookieContainer.Add(new Cookie("PHPSESSID", "b190qo7orr2b9oaaoplsi9t7s7", "/", "www.donationalerts.ru"));
            req.CookieContainer.Add(new Cookie("_gat", "1", "/", "www.donationalerts.ru"));
            req.Method = "POST";
            req.Timeout = 100000;
            req.UserAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36";
            req.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";