Question VS 2010 WebBrowserControl Prevent File Downloads

[aaronmchale]

I found this code that is supposed to prevent the user from downloading files:

    Private Sub WebBrowser_Navigating(ByVal sender As Object, ByVal e As System.Windows.Forms.WebBrowserNavigatingEventArgs)
        Dim HTTPRequest As System.Net.WebRequest = System.Net.WebRequest.Create(e.Url.ToString)
        Dim HTTPResponse As System.Net.WebResponse
        HTTPRequest.Method = "HEAD"
        HTTPResponse = HTTPRequest.GetResponse()
        If (Not HTTPResponse.ContentType.StartsWith("text/")) Then
            e.Cancel = True
            MsgBox("You are not allowed to download files.", MsgBoxStyle.Information, "Download file")
        End If
    End Sub

When the code is run the application stops responding, the problem seems to be the code after the "=" on the second line.

Help please!

Thanks
Aaron