a Data access layer can be an important part of software application.
Advantage
1. In ModificationAny change in DataAccessLayer will not affect your UserInterface or Business Layer.
2. Database IndepedentYou can also switch your database from one database to another database (like SQL Server to Oracle).So your DAL will be database neutral, that happened when you use factory patten in DAL and implement interfaces like IdbCommand, IdbConnection,IdbDataAdapter
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