When an exception is thrown (while debugging in the IDE), i have the opportunity to view details of the exception:
Each left-side name is property in the Exception. If you want to display Message field, you can do
return ex.Message;
Pretty simple. Likewise, the StackTrace can be displayed as below link.
A complete example of StackTrace: http://msdn.microsoft.com/en-us/library/system.exception.stacktrace.aspx
and Exception class: http://msdn.microsoft.com/en-us/library/system.exception.aspx