private static HttpWebRequest CreateRequest(string uri, Cookie[] cookies, string contentType, string parameters)
{
var request = (HttpWebRequest)WebRequest.Create(uri);
request.CookieContainer = new CookieContainer();
if (cookies != null)
cookies.ToList().ForEach(cookie => request.CookieContainer.Add(cookie));
request.AllowAutoRedirect = false;
request.Method = "POST";
request.ContentType = contentType;
request.ContentLength = parameters.Length;
return request;
}