I'm developing an xbox indie game and as a last-resort I have a try...catch encompassing everything.

At this point if an exception is raised I can get the user to send me a message through the xbox however the limit is 250 characters.

How can I get the most value out of my 250 characters?

I don't want to do any encoding / compressing at least initially.
Any solution to this problem could be compressed if needed as a second step anyway.

I'm thinking of doing things like turning this:

at EasyStorage.SaveDevice.VerifyIsReady()
at EasyStorage.SaveDevice.Save(String containerName, String fileName)

into this (drop the repeated namespace/class and method parameter names):

at EasyStorage.SaveDevice.VerifyIsReady()
at ..Save(String, String)

Or maybe even just including the inner-most method, then only line numbers up the stack etc.

TL;DR: Given an exception with a stacktrace how would you get the most useful debugging infromation out of 250 characters?

^{(It will be a .net exception/stacktrace)}