Either you are writing a program in Java or .NET, the questions remains that why to create custom exceptions in the first place? I, in my initial years as IT professional, also kept wondering on why, at all, there is a need for custom exceptions whenever I use to come across one of these types. At the same time, I also wondered on how to come up with right names for custom exceptions if at all I want to create one. Please feel free to add to the below reasons if you believe that there are other points that should also be covered as part of benefits for creating custom exceptions.
Following are top 4 reasons why you would want to create custom exceptions rather than using out-of-the-box exceptions from specific programming languages such as .NET or Java etc:
The easier way to come up with name of custom exception is to name the exception after business functionality. For example, AccountRegistrationException as mentioned in above example.
Following are some good reads on when to create custom exception with .NET programming.
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