Handling Errors in a custom page

[ThunderMusic]

Hi,
I'd like to handle all some of my exception by a custom page. I put the
validations in the global.asax to redirect to the custom page, but everytime
an exception is raised, the Server.GetLastError() is == to null in the
page_load of my custom page... Even if I set the exception in the Session,
it's empty when it gets to my custom page. why is this? Is there anyway I
can get the last generated exception from my custom error page?

thanks

ThunderMusic