How are system exceptions different from application exceptions in .NET?

During execution of your program, if there is any unexpected behavior then exception will be thrown and the program will be terminated. .NET provides good exception handling using the exception classes.

For any exception, System.Exception is the base class. This System.Exception is classified into system exceptions and application exceptions. System exceptions are predefined exceptions provided by .NET. All framework exceptions form part of system exceptions. Application exceptions are application specific, encouraging user to define their own user defined exceptions.

The exception hierarchy of .NET is illustrated using the diagram shown below:


The purpose of system exception, application exception and how they are different from one another are tabulated below:

System Exception
Application Exception
CLR throws system exception Application throws application exception
System exceptions are generic in nature Application exceptions are not generic. Each application exception has its own customized meaning
Each system exception has a meaning. You can directly use them or you can derive new ones by inheriting System.Exception Application exceptions do not have a meaning for themselves. You have to explicitly derive from them and create your own custom exceptions specific to your application
Example for system exceptions include SqlException, StackOverflowException Example for application exceptions include SharePointException, CmsException

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