Как работать с POST запросами? (Нужно создать авторизацию, с cookie)

Imports System.Net
Imports System.IO
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim request As Net.HttpWebRequest = CType(Net.HttpWebRequest.Create("http://murclub.ru/index.php?&login=" + TextBox1.Text + "&password=" + TextBox2.Text + "&hop=1"), Net.HttpWebRequest)
        request.Method = "POST"
        request.UseDefaultCredentials = True
        request.Referer = "http://murclub.ru/index.php"
        request.Host = "http://murclub.ru"
        request.CookieContainer = New CookieContainer()
    End Sub
End Class

Imports System.Net
       Imports System.IO
 
        Dim WC As New WebClient 
        Dim Strings, Result As String 
        Strings = WC.DownloadString("http://murclub.ru/index.php?&login=" + TextBox1.Text + "&password=" + TextBox2.Text + "&hop=1") 
        WC.Dispose()

Imports System.Net
Imports System.Text
Imports System.IO
Public Class Form1
    Dim logincookie As CookieContainer
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim postData As String = "login=" & TextBox1.Text & "&password=" & TextBox2.Text & "&hop=1" ' Вот тут нужно работать с (TamperData,Просмотр HTTP заголовков или Charles) - все они работают на Firefox. Смотреть ниже
        Dim tempCookie As New CookieContainer
        Dim encoding As New UTF8Encoding
        Dim byteDate As Byte() = encoding.GetBytes(postData)
 
        Dim postReq As HttpWebRequest = DirectCast(WebRequest.Create("http://murclub.ru/index.php"), HttpWebRequest)
        postReq.Method = "POST"
        postReq.KeepAlive = True
        postReq.CookieContainer = tempCookie
        postReq.ContentType = "application/x-www-form-urlencoded"
        postReq.Referer = "http://murclub.ru/index.php"
        postReq.UserAgent = "Mozilla/5.0 (Windows NT 6.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"
        postReq.ContentLength = byteDate.Length
 
        Dim postreqstream As Stream = postReq.GetRequestStream
        postreqstream.Write(byteDate, 0, byteDate.Length)
        postreqstream.Close()
 
        Dim postreqresponce As HttpWebResponse
 
        postreqresponce = DirectCast(postReq.GetResponse(), HttpWebResponse)
        tempCookie.Add(postreqresponce.Cookies)
        logincookie = tempCookie
 
        Dim postreqreader As New StreamReader(postreqresponce.GetResponseStream())
 
        Dim thepage As String = postreqreader.ReadToEnd
 
        RichTextBox1.Text = thepage
    End Sub