如果发生未处理的异常，我需要关闭WPF应用程序吗？

I have a WPF Application basically the exe is a loader for the application UI and sometimes when a unhandled execption occurs the message box is shown and when I click ok it goes away,the UI vanishes etc..,the instance of the exe is still there,I need some mechanism that when and exception that is unhandled occurs shutdown the exe since i have code that checks for multiple instances so the user would have to kill the crashed instance.Any suggestions or code?I have a WPF Application basically the exe is a