vb.net Login to a .asp website help

[Firetech]

I have been trying to make a program that automatticly login to my schools website and this si the code I tried so far

Schools website - "http://gronlokke-skolen.dk/pi/Loginside.asp"

Code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        WebBrowser1.Navigate("http://gronlokke-skolen.dk/pi/")
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        WebBrowser1.Document.GetElementById("Brugernavn").SetAttribute("value", TextBox1.Text)
        WebBrowser1.Document.GetElementById("Adgangskode").SetAttribute("value", TextBox2.Text)

    End Sub
End Class