In my global.asax, I have something like this:

    Sub Application_PreRequestHandlerExecute(ByVal sender As Object, ByVal e As EventArgs)
        Dim loPage As System.Web.UI.Page = Context.Handler
        LXFramework.oPage = loPage
    End Sub

This works well. It allows me to initialize the oPage property of the framework. But, I need to add a verification in here. Because, I need to simply return if Context.Handler is of type System.Web.HttpForbiddenHandler. Because if someone tries to pull out a file with a .vb extension, such as account.aspx.vb, this will return the following error on the Dim line:

Unable to cast object of type 'System.Web.HttpForbiddenHandler' to type 'System.Web.UI.Page'.

So, what can I do to have some kind of condition in here to verify for this?