I can't login to website using httpwebrequest - windows-phone-8

Question

I'm trying login to website(example: https://www.facebook.com/login.php?login_attempt=1) using httpwebrequest by POST. But It's not return result after login.
I don't know what is wrong with my code, can you help me? Thanks so much!
This is my code:
private void Button_Click_1(object sender, RoutedEventArgs e)
{
System.Uri myUri = new System.Uri("https://www.facebook.com/login.php?login_attempt=1");
HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create(myUri);
myRequest.Method = "POST";
myRequest.ContentType = "application/x-www-form-urlencoded";
myRequest.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), myRequest);
}
void GetRequestStreamCallback(IAsyncResult callbackResult)
{
HttpWebRequest myRequest = (HttpWebRequest)callbackResult.AsyncState;
// End the stream request operation
Stream postStream = myRequest.EndGetRequestStream(callbackResult);
StringBuilder postData = new StringBuilder();
postData.Append("email=myEmail");
postData.Append("&password=myPassword");
byte[] byteArray = Encoding.UTF8.GetBytes(postData.ToString());
postStream.Write(byteArray, 0, postData.Length);
postStream.Close();
myRequest.BeginGetResponse(new AsyncCallback(GetResponsetStreamCallback), myRequest);
}
void GetResponsetStreamCallback(IAsyncResult callbackResult)
{
HttpWebRequest request = (HttpWebRequest)callbackResult.AsyncState;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(callbackResult);
using (StreamReader httpWebStreamReader = new StreamReader(response.GetResponseStream()))
{
string result = httpWebStreamReader.ReadToEnd();
//For debug: show results
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
// something do
});
}
}

Answer 1

I had just a quick look: https://www.facebook.com/login.php 's input fields are named "email" and "pass" (not "password").
Untested: Change
postData.Append("&password=myPassword");
to
postData.Append("&pass=myPassword");
Even if this works, I doubt that you get much further with whatever you intend to do. I recommend using one of the Facebook SDKs.