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Microsoft TS: Accessing Data with Microsoft .NET Framework 4 Sample Questions:

1. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application.
You use the ADO.NET Entity Framework Designer to model entities.
The application includes self-tracking entities as shown in the following diagram.

There is a Person entity names person1 that has TrackChanges turned on.
You need to delete all e-mail addresses that are associated with person1 by using an ObjectContext.
What are two possible code segments that you can use to achieve this goal?
(Each correct answer presents a complete solution. Choose two).

A) while(person1.EMailAddresses.Count>0){
person1.EmailAddresses.RemoveAt(0);
}
context.SaveChanges();
B) person1.EMailAddresses = null; context.SaveChanges();
C) person1.EMailAddresses = new TrackableCollection<EMailAddress>(); context.SaveChanges();
D) foreach(var email in person1.EMailAddresses){
email.MarkAsDeleted();
}
context.SaveChanges();

2. You use Microsoft .NET Framework 4.0 to develop an application that uses LINQ to SQL. The LINQ to SQL
model contains the Product entity.
A stored procedure named GetActiveProducts performs a query that returns the set of active products from
the database.
You need to invoke the stored procedure to return the active products, and you must ensure that the LINQ
to SQL context can track changes to these entities. What should you do?

A) Select the Product entity, view the entity's property window, and change the Name for the entity to GetActiveProducts.
B) Select the Product entity, view the entity's property window, and change the Source for the entity to GetActiveProducts.
C) Navigate to the GetActiveProducts stored procedure in Server Explorer, and drag the procedure onto the Product entity in the LINQ to SQL model designer surface.
D) Add a property named GetActiveProducts to the Product entity.

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
uses the Entity Framework.
The application has an entity model that includes SalesTerritory and SalesPerson entities as shown in the
following diagram.

You need to calculate the total bonus for all sales people in each sales territory. Which code segment should you use?

A) model.SalesTerritories .GroupBy(territory => territory.SalesPersons) .SelectMany(group => group.Key) .Sum(person => person.Bonus);
B) from territory in model.SalesTerritories group territory by territory.SalesPerson into personByTerritories select new {
SalesTerritory = personByTerritories.Key,
TotalBonus = personByTerritories.Key.Sum(person => person.Bonus)
};
C) model.SalesPersons .GroupBy(person => person.SalesTerritory) .SelectMany(group => group.Key.SalesPersons) .Sum(person => person.Bonus);
D) from person in model.SalesPersons group person by person.SalesTerritory into territoryByPerson select new {
SalesTerritory = territoryByPerson.Key,
TotalBonus = territoryByPerson.Sum(person => person.Bonus)
};

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You deploy a Windows Communication Foundation (WCF) Data Service to a production server.
The application is hosted by Internet Information Services (IIS).
After deployment, applications that connect to the service receive the following error message:
"The server encountered an error processing the request. See server logs for more details."
You need to ensure that the actual exception data is provided to client computers. What should you do?

A) Modify the application's Web.config file. Set the value for the customErrors element to Off.
B) Modify the application's Web.config file. Set the value for the customErrors element to RemoteOnly.
C) Add the FaultContract attribute to the class that implements the data service.
D) Add the ServiceBehavior attribute to the class that implements the data service.

5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server database. The application stores encrypted credit card
numbers in the database.
You need to ensure that credit card numbers can be extracted from the database.
Which cryptography provider should you use?

A) AESCryptoServiceProvider
B) SHA1CryptoServiceProvider
C) DSACryptoServiceProvider
D) MD5CryptoServiceProvider

Solutions: