Why does Exception.StackTrace disappear?

I'm attempting to catch unhandled exceptions in my app on windows 8.1
I've noticed that in my App_UnhandledException handler, that the UnhandledExceptionArgs.Exception.StackTrace is valid on entry.
However, I take the same Exception object, and pass it to a function, and the value mysteriously becomes null.
As a workaround, I capture the stack trace into a string variable before any other operations on the exception object, but I don't understand why this should be necessary.
Anthony Wieser | Wieser Software Ltd |
www.wieser-software.com

For some reason, it seems the getter of the 'Exception' property of the 'UnhandledExceptionEventArgs' returns the original exception the first time (I've checked, it's the exact same reference), and creates a new exception the subsequent times. I don't know
where this behavior comes from, but instead of saving the stacktrace you should keep a reference to the whole exception:
var exception = e.Exception;
// Now inspect exception instead of e.Exception

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my task is to make a program that can be used in the libraries!
the main task is that i make a programm which will be an object-oriented database.
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