System exceptions and Application exceptions

Question

Hi Friends what is the difference between System exceptions and Application exceptions?

Datta Kharad · Answer

Hi There are 2 important classes in the hierarchy that are derived from System.Exception: 1)System.SystemException:- This class is for exceptions that r usually thrown by the .net runtime, or which r considered to be of a generic nature and must be thrown by almost any application. For example, StackOverflowException will be thrown by the .net runtime if it detects the stack is full. On the other hand, u might choose to throw ArgumentException or it's subclasses in ur code, if u detect that a method has been called with inappropriate arguments. Subclasses of System.SystemException includes classes that represent both fatal and non-fatal errors. 2)System.ApplicationException:- This class is important, becoz it is the intended base for any class of exception defined by third parties. Hence, if u define any exceptions covering error conditions unique to ur application, u should derive these directly or indirectly from System.ApplicationException For more detail you can refer below links:- http://www.merithub.com/q/113-difference-system-exceptions-application-exceptions.aspx http://www.interviewqsn.com/difference-between-system-exception-and-application-exceptions.html

Vulpes · Answer

The original idea was that you should derive from ApplicationException when creating custom exceptions to be thrown by your application. SystemExceptions were reserved for pre-defined exceptions within the .NET Framework that were thrown by the CLR itself. However, in practice, this distinction was found to be useless and the recommendation now is that custom exceptions should derive from System.Exception. See this blog post: http://blogs.msdn.com/b/kcwalina/archive/2006/06/23/644822.aspx