Captcha + cookie

Olá, não sou bom com plataforma .NET, ainda trabalho com ASP Clássico, gostaria de saber se tem como converter este código VB.NET em uma página asp.net? por onde eu começo?

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

Public Class Form1

Private PackCookies As New CookieContainer()

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

CarregarCaptcha()

End Sub

Private Sub CarregarCaptcha()

TxtNome.Text = "-"
TxtStatus.Text = "-"

Dim request As HttpWebRequest = HttpWebRequest.Create("http://www.receita.fazenda.gov.br/scripts/srf/intercepta/captcha.aspx?opt=image")
request.ContentType = "application/x-www-form-urlencoded"
request.CookieContainer = New CookieContainer()

Dim response As HttpWebResponse = request.GetResponse()

For Each tempCookie As Net.Cookie In response.Cookies

If tempCookie.Name = "cookieCaptcha" Then
PackCookies.Add(tempCookie)
End If

Next

Dim stream As IO.Stream = response.GetResponseStream()
CampoPicture.Image = Image.FromStream(stream)

End Sub

Private Sub BtnConsultar_Click(sender As System.Object, e As System.EventArgs) Handles BtnConsultar.Click

Dim CCPF, CCaptcha As String

CCPF = CampoCPF.Text
CCPF = CCPF.Replace(".", "")
CCPF = CCPF.Replace(",", "")
CCPF = CCPF.Replace("-", "")

CCaptcha = CampoCaptcha.Text

If CCPF = "" Then

MessageBox.Show("Preencha o CPF!")

ElseIf CCaptcha = "" Then

MessageBox.Show("Preencha o Captcha!")

Else

Dim byteArray As Byte() = Encoding.UTF8.GetBytes("txtCPF=" & CCPF & "&idLetra=" & CCaptcha & "&Enviar=Consultar")
Dim request As HttpWebRequest = HttpWebRequest.Create("http://www.receita.fazenda.gov.br/aplicacoes/atcta/cpf/ConsultaPublica.asp")

request.ContentType = "application/x-www-form-urlencoded"
request.CookieContainer = PackCookies
request.Method = "POST"
request.ContentLength = byteArray.Length

Dim dataStream As Stream = request.GetRequestStream()
dataStream.Write(byteArray, 0, byteArray.Length)
dataStream.Close()

Dim response As WebResponse = request.GetResponse()

dataStream = response.GetResponseStream()
Dim reader As New StreamReader(dataStream)
Dim responseFromServer As String = reader.ReadToEnd()

Dim webBrowser As New WebBrowser()

Dim myHTML As String = responseFromServer

webBrowser.DocumentText = myHTML
webBrowser.ScriptErrorsSuppressed = True

AddHandler webBrowser.DocumentCompleted, New WebBrowserDocumentCompletedEventHandler(AddressOf ManipulaRetornoRF)

reader.Close()
dataStream.Close()
response.Close()

End If

End Sub

Private Sub ManipulaRetornoRF(ByVal sender As Object, ByVal e As WebBrowserDocumentCompletedEventArgs)

Dim webBrowserForPrinting As WebBrowser = CType(sender, WebBrowser)
Dim NNome, NStatus, FNome, FStatus As String
Dim ANome, AStatus As Array

Dim doc As HtmlDocument = webBrowserForPrinting.Document

If doc.Body.InnerHtml.Contains("Comprovante emitido") Then

NNome = doc.GetElementsByTagName("span").Item(5).InnerHtml
ANome = NNome.Split(":")
FNome = Trim(ANome(1))

NStatus = doc.GetElementsByTagName("span").Item(6).InnerHtml
AStatus = NStatus.Split(":")
FStatus = Trim(AStatus(1))

TxtNome.Text = FNome
TxtStatus.Text = FStatus

Else

MessageBox.Show("Dados inválidos!")

TxtNome.Focus()
CarregarCaptcha()

End If

End Sub

Private Sub Button6_Click(sender As System.Object, e As System.EventArgs) Handles Button6.Click

Sobre.ShowDialog()

End Sub
End Class