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1.You are designing the data access layer (DAL) for an application that uses Microsoft SQL Server 2008,
Microsoft ADO.NET, and Microsoft Visual Studio 2010.
Conflicts are occurring in the SQL Server database due to concurrent updates.
You need to design a database locking strategy that meets the following requirements:
Resolves concurrent update conflicts without loss of data
Ensures that data conflicts can be resolved by users
Locks only the data necessary for updates
What should you do?
A.Use optimistic locking.Terminate the update when a DBConcurrencyException occurs.
B.Use pessimistic locking.Terminate the update when a DBConcurrencyException occurs.
C.Use pessimistic locking.Retry the failing update operation in the DBConcurrencyException exception
handler until it succeeds.
D.Use optimistic locking.In the DBConcurrencyException exception handler, display the data of both
original and updated records to the user.Allow the user to resolve the conflicts.
2.You are designing an application by using Microsoft .NET Framework 4, Microsoft Visual Studio 2010,
and Microsoft SQL Server 2008.
The application will be used by a sales team to enter sales orders and update customer information.
You need to ensure that the application meets the following requirements:
Allows users to enter sales orders while their computers are disconnected from the network
Uploads sales orders to the server database when connected to the network
Compiles against the .NET Framework 4 client profile
What should you use?
B.WCF servicesA.Microsoft Sync Framework
C.the System.Web.Caching namespace classes
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