Custom Error Page

[Fishcake]

I have a custom error that displays ok but i also wanted to send a detailed email to the site admin informing them of the error.

I've found several examples that seem to do this by setting

<customErrors mode="On" defaultRedirect="errorpage.aspx" />

In the web.config file.

From this i can get the path for the file that caused the error as such

Dim ErrorUrl As String = Request.Params("aspxerrorpath").ToString

I'd also like to get more detailed information though which i've tried doing as specified in the many samples i've found

Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
        ' Fires when an error occurs
        Dim objError As Exception = Server.GetLastError()
        HttpContext.Current.Application.Add("lastException", objError)
        Server.ClearError()
    End Sub

The idea then being to build up the body of the email to send with the path of the error and a detailed description of it. But i don't seem to be able to get both events to fire as if i have code in the application_error event then the user doesn't get redirected to the errorpage.

Any idea's whats going wrong/on?