ผมเป็นปัญหา HTTP REQUEST มันเว้ปนี้มัน get ไม่เป็นอะครับ VB.NET ช่วยผมหน่อยครับ

Imports System.Net
Imports System.Text
Imports System.IO

Public Class Form1

    Dim logincookie As CookieContainer

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Dim postData As String = "t=signin&email=bleed952&password=iwb1hohptc"
        Dim tempCookies As New CookieContainer
        Dim encoding As New UTF8Encoding
        Dim byteData As Byte() = encoding.GetBytes(postData)

        Dim postReq As HttpWebRequest = DirectCast(WebRequest.Create("http://www.linkcollider.com/task.php"), HttpWebRequest)
        postReq.Method = "POST"
        postReq.KeepAlive = True
        postReq.CookieContainer = tempCookies
        postReq.ContentType = "application/x-www-form-urlencoded"
        postReq.Referer = "http://www.linkcollider.com/"
        postReq.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.9.2.3) Gecko/20100401 Firefox/4.0 (.NET CLR 3.5.30729)"
        postReq.ContentLength = byteData.Length

        Dim postreqstream As Stream = postReq.GetRequestStream()
        postreqstream.Write(byteData, 0, byteData.Length)
        postreqstream.Close()
        Dim postresponse As HttpWebResponse

        postresponse = DirectCast(postReq.GetResponse(), HttpWebResponse)
        tempCookies.Add(postresponse.Cookies)
        logincookie = tempCookies
        Dim postreqreader As New StreamReader(postresponse.GetResponseStream())
        Dim thepage As String = postreqreader.ReadToEnd

        RichTextBox1.Text = thepage


        'end post


    End Sub

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

    End Sub



    Private Sub Button2_Click_1(sender As Object, e As EventArgs) Handles Button2.Click
        Dim request As HttpWebRequest = DirectCast(WebRequest.Create("http://www.linkcollinder.com"), HttpWebRequest)
        request.CookieContainer = logincookie

        Dim response As HttpWebResponse = DirectCast(request.GetResponse(), HttpWebResponse)
        Dim reader As New StreamReader(response.GetResponseStream())
        Dim theusercp As String = reader.ReadToEnd

        RichTextBox1.Text = theusercp

    End Sub
End Class