ASP.NET MVC: HandleError action filter
HandleError attribute is used to catch unhandled exception in controller action method. In default MVC template, HandleError attribute is already added to GlobalFilterCollection. In MVC 3, we can see it in Global.asax while in MVC 4 we can see it in App_Start/FilterConfig.cs. One thing to keep in mind is that HandleError will handle exception only if customErrors mode="On" is set in web.config.
