Come costruire un bot?

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://tuourl");
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)";
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
request.Headers.Add("Accept-Language", "it-it,it;q=0.8,en-us;q=0.5,en;q=0.3");
request.KeepAlive = true;
request.Timeout = 2000;
saveResponse(request.GetResponse().GetResponseStream(), "nomefile.ext");

private void saveResponse(Stream source, String filename)
{

  FileStream target = new FileStream(filename, FileMode.Create);
  byte[] buffer = new byte[0x10000];
  int bytes;
  try
  {
    while ((bytes = source.Read(buffer, 0, buffer.Length)) > 0)
    {
      target.Write(buffer, 0, bytes);
    }

  }
  finally
  {
    target.Flush();
    target.Close();

  }

}

using System.Text;
using System.Security.Cryptography;

 public static class PasswordHasher
        {
            private static SHA256Managed hasher = new   SHA256Managed();

            public static string Hash(string password)
            {
                UTF8Encoding utf8 = new UTF8Encoding();
                byte[] passwordBytes = utf8.GetBytes(password.ToUpper());
                byte[] passwordHash = hasher.ComputeHash(passwordBytes);
                return toHexString(passwordHash);
            }

        public static string toHexString(byte[] a)
            {
                StringBuilder sb = new StringBuilder(a.Length * 2);
                foreach (byte b in a)
                {
                    sb.AppendFormat("{0:X2}", b);
                }
                return sb.ToString();
            }
        }

String passwordCriptata = PasswordHasher.Hash("password");

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class NetUtils
    {
        [DllImport("wininet.dll", SetLastError = true)]
        public static extern bool InternetGetCookie(
          string url, string cookieName,
          StringBuilder cookieData, ref int size);

        public static CookieContainer GetUriCookieContainer(Uri uri)
        {
            CookieContainer cookies = null;

            int datasize = 256;
            StringBuilder cookieData = new StringBuilder(datasize);

            if (!InternetGetCookie(uri.ToString(), null, cookieData,
              ref datasize))
            {
                if (datasize < 0)
                    return null;

                cookieData = new StringBuilder(datasize);
                if (!InternetGetCookie(uri.ToString(), null, cookieData,
                  ref datasize))
                    return null;
            }

            if (cookieData.Length > 0)
            {
                cookies = new CookieContainer();
                cookies.SetCookies(uri, cookieData.ToString().Replace(';', ','));
            }
            return cookies;
        }
    }