Help with WebBrowser app

Everyone,

My code is below I am trying to build an app that would feed stock quotes into a textbox on a webpage, submit that page and retrieve the resulting quote. I am coding based upon a tutorial I received from a member here but I can't seem to get the page manipulated. When ever I run I get a NullReferenceException error at the line highlighted. Hopefully someone can help.

Thanks

VB Code:

Private Sub frmMain_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        WebBrowser.Navigate("http://moneycentral.msn.com/investor/research/welcome.asp")
    End Sub
    Private Function GetCurrentWebDoc() As mshtml.HTMLDocument
        Try
            Return DirectCast(WebBrowser.Document, mshtml.HTMLDocument)
        Catch ex As Exception
            Return Nothing
        End Try
    End Function
    Private Function GetCurrentWebForm() As mshtml.HTMLFormElement
        Try
            If GetCurrentWebDoc.forms.length > 0 Then
                Return DirectCast(GetCurrentWebDoc.forms.item(0), mshtml.HTMLFormElement)
            Else
                Return Nothing
            End If
        Catch ex As Exception
            Return Nothing
        End Try
    End Function
   
 
   Private Sub SetTextboxText(ByVal Text As String)
        [COLOR=Red]DirectCast(GetCurrentWebForm.item("Symbol"), mshtml.HTMLInputElement).value = Text[/COLOR]    
End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        SetTextboxText(txtdata.Text)
        ClickSubmitButton()
    End Sub
    Private Sub ClickNormalButton()
        DirectCast(GetCurrentWebForm.item("q", 0), mshtml.HTMLButtonElement).click()
    End Sub
    Private Sub ClickSubmitButton()
        DirectCast(GetCurrentWebForm.item("go", 0), mshtml.HTMLButtonElement).click()
    End Sub