Hi,

Please suggest how can we implement transactions at BAL in 3 tier
architecture not in DAL. also objectcontext object which was used with
ASP will be requiered to do this.

Thanks
Ravi

Unfortunately the answer isn't as simple as your question is.

Transactions implemented in the database are a lot simpler because the
database maintains transactions via log mechanisms. It can offer you
fantastic control over isolation levels - which in turn give you a much more
responsive application.

In contrast, transactions on non-database entities are controlled by a
transaction co-ordinator - MSDTC if in case you are using ObjectContext in
classic ASP. This will invariably bump up your isolation levels in most
instances, and hence lead to a practically unusable production application.

An easy way to create a good implementation is using .NET 2.0/SQL Server
2005/System.Transactions - but apparently you are too far from that
architecture.

Given all of these, I would keep most of your transactions in the DAL,
rather than BL. It sounds like a good idea to make BL operations
transactional, but that requirement is best addressed by proper design of
the BL, not expecting MSDTC/MTS/COM+/EnterpriseServices to take care of this
for you.

- Sahil Malik [MVP]
ADO.NET 2.0 book -
http://codebetter.com/blogs/sahil.malik/archive/2005/05/13/63199.aspx
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