10774: transaction: database or .net framework?

Hello experts:

1. When should I use transactions in the database? (begin, commit, rollback)
2. When I use the .net framework?

Which is better?
enrique_aeoAsked:
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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
When should you use transactions? When you have a piece of code that you might want to undo.

For example, I might
BEGIN TRAN
UPDATE a table
SELECT the updated table
ROLLBACK TRAN
Because I didn't actually want to commit the changes, just see what would happen.

Or I want to
debit someone's bank account, then
Credit someone else's.
If the credit didn't work, undo the debit.
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enrique_aeoAuthor Commented:
OK

but, When I use the from  .net framework?
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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
I would suggest asking that as a separate question.
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ste5anSenior DeveloperCommented:
It's simply a question of granularity.

Can a (distributed) database transaction do what you want? Or are external resources involved, which require special handling?
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Microsoft SQL Server 2008

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