Авторизация на сайте через post запрос

Dim request1 As HttpWebRequest = HttpWebRequest.Create("http://forum.minecraft-galaxy.ru/main/")
        Dim request As HttpWebRequest = HttpWebRequest.Create("http://forum.minecraft-galaxy.ru/login.php")
        request1.Method = "POST"
        request1.Accept = "..."
        request1.UserAgent = "..."
        request1.ContentType = "."
        request1.Referer = "http://forum.minecraft-galaxy.ru/guilogin/"
        request.Method = "POST"
        request.Accept = "..."
        request.UserAgent = "...."
        request.ContentType = "..." 
        request.Referer = "http://forum.minecraft-galaxy.ru/guilogin/" 'всякие поля, которые я заполняю 
        Dim data As String = "login=...&pass=..." 'логин и пароль
        Dim writer As New StreamWriter(request.GetRequestStream(), Encoding.Default)
        writer.Write(data)
        writer.Close()
        Dim stream As Stream = request.GetResponse().GetResponseStream()
        Dim reader As New StreamReader(stream, Encoding.Default)
        Dim response As String = reader.ReadToEnd
        request.Abort()
 
        Dim Request2 As HttpWebRequest = HttpWebRequest.Create("") 'ссылка для работы 2 части программы
        Dim Response2 As HttpWebResponse
        Request2.Method = "POST"
        Request2.AllowAutoRedirect = False
 
        Dim reqString As String = "form=&invite=&user=..." 'user - кого инвайтить
        Dim requestData As Byte() = Encoding.Default.GetBytes(reqString)
 
        Using s As Stream = Request2.GetRequestStream()
            s.Write(requestData, 0, requestData.Length)
        End Using
        Response2 = Request2.GetResponse

Dim postdata As String = "form=&ref=http%3A%2F%2Fforum.minecraft-galaxy.ru%2Fmain%2F&login=" & TextBox1.Text & "&pass=" & TextBox2.Text