HttpWebRequest POST and Cookies - vb.net

Question

Hi am trying to make an application that post data to a joomla login page but the only thing i get back is cookies is not enabled.
Function GetPage(ByVal Url As String) As String
Dim CookieJar As New Net.CookieContainer
Dim enc As Encoding = Encoding.GetEncoding(1252)
Dim Data As Byte() = Nothing
Dim PostData As String = ""
If InStr(Url, "?") <> 0 Then
PostData = Url.Substring(InStr(Url, "?"))
Url = Replace(Url, PostData, "")
Url = Url.TrimEnd("?"c)
Data = enc.GetBytes(PostData)
End If
Dim req As System.Net.HttpWebRequest = CType(Net.WebRequest.Create(Url), Net.HttpWebRequest)
req.AllowAutoRedirect = False
req.ContentType = "application/x-www-form-urlencoded"
req.Method = "POST"
If Not Data Is Nothing Then
If Data.Length > 0 Then
req.ContentLength = Data.Length
Dim newStream As Stream = req.GetRequestStream()
newStream.Write(Data, 0, Data.Length)
newStream.Flush()
newStream.Close()
End If
End If
req.CookieContainer = CookieJar
Dim Response As Net.HttpWebResponse = CType(req.GetResponse(), Net.HttpWebResponse)
Dim ResponseStream As IO.StreamReader = New IO.StreamReader(Response.GetResponseStream(), enc)
Dim Html As String = ResponseStream.ReadToEnd()
Response.Close()
ResponseStream.Close()
Return Html
End Function
How should i do?

Answer 1

Try to set .CookieContainer before writing any data to .GetRequestStream()
Look this sample:
CookieContainer cookies = new CookieContainer();
HttpWebRequest postRequest = (HttpWebRequest)WebRequest.Create(site);
postRequest.CookieContainer = cookies; // note this
postRequest.Method = "POST";
postRequest.ContentType = "application/x-www-form-urlencoded";
using (Stream stream = postRequest.GetRequestStream())
{
stream.Write(buffer, 0, buffer.Length);
}