Авторизация Vk с HttpWebRequest

HttpWebResponse^ response = nullptr;
HttpWebRequest^ request = (HttpWebRequest^) HttpWebRequest::Create("http://vkontakte.ru/login.php");
request->CookieContainer = gcnew CookieContainer();
Cookie^ cookies = gcnew Cookie();
request->Proxy = HttpWebRequest::GetSystemWebProxy();
request->Method = "POST";
request->ContentType = "application/x-www-form-urlencoded";
String^ FormParams = "email=myemail&pass=mypass&action=login";
array<System::Byte> ^SomeBytes = System::Text::Encoding::UTF8->GetBytes(FormParams);
request->ContentLength = SomeBytes->Length;
 
Stream^ NewStream = request->GetRequestStream();
                
NewStream->Write(SomeBytes, 0 ,SomeBytes->Length);
NewStream->Flush();
response = (HttpWebResponse^)request->GetResponse();
                        
HttpWebRequest^ req1 = (HttpWebRequest^) HttpWebRequest::Create("http://vkontakte.ru/");
//req1->UserAgent = "Mozilla/4.0+(compatible;+MSIE+5.01;+Windows+NT+5.0)";
req1->CookieContainer = gcnew CookieContainer();
req1->CookieContainer->Add(response->Cookies);
req1->Method = "GET";
HttpWebResponse^ resp1 = (HttpWebResponse^) req1->GetResponse();
Stream^ DataStream = resp1->GetResponseStream();
StreamReader^ sr = gcnew StreamReader(DataStream, System::Text::Encoding::Default);
String^ rFromServ = sr->ReadToEnd();