I can't login to facebook with httpwebrequest

[EDN Admin]

<span>my codes here:<br/>
<br/>
string postdataman = "lsd=AVpgvQM_&email=myemail@wow.com&pass=12345678&persistent=1&default_persistent=1" + "&charset_test=€, ´,€, ´,æ°´,Ð",Є" + "&timezone=-180&lgnrnd=104940_e5yZ&lgnjs=1339181436&locale=en_US";<br/>
string url = "http://facebook.com";<br/>
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);<br/>
byte[] bytearray = Encoding.UTF8.GetBytes(postdataman);<br/>
req.Method = "POST";<br/>
req.ContentType = "application/x-www-form-urlencoded";<br/>
req.ContentLength = bytearray.Length;<br/>
Stream stream = req.GetRequestStream();<br/>
stream.Write(bytearray, 0, bytearray.Length);<br/>
WebResponse res = req.GetResponse();<br/>
stream = res.GetResponseStream();<br/>
StreamReader sr = new StreamReader(stream);<br/>
string result = sr.ReadToEnd();<br/>
textBox3.Text = result;<br/>
if (result.Contains("blabla"))<br/>
{<br/>
MessageBox.Show("login successful");<br/>
}<br/>
stream.Close();<br/>
res.Close();<br/>
sr.Close();<br/>
<br/>
why this code doesnt work it cant login to facebook. I am working on this **** for 24 hours... My eyes are hurting a lot now but still I cant solve this problem<br/>
<br/>
Where is my error in my codes <br/>
<br/>

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