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What are the best practices for exception handling in n-tier applications?

The application is a fat client based on MVVM pattern with .NET framework.

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    you don't give any details about the programming platform, dbb, etc. please detail, best regards, – RBA Jan 4 '11 at 9:50
  • microsoft.com/downloads/en/… – RBA Jan 4 '11 at 9:57
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The only advice I can give is that the exception and overall error handling should be taken care at the design level, and not at the implementation level. Making sure that at least a proper framework is at place for error-handling is important. Adding exception code later, most probably will need the design change and hence many changes in the code than expected.

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This seems to be a pretty hard question, I asked about the same at stackoverlfow and this article came closest to what I wanted.

Specifics for MVVM I haven't seen.

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