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. You create the classes shown in the following exhibit:

You add the following code segment to the application. (Line numbers are included for reference only.)
01 public void QueryPlayers (List <League> leagues) {
02 ...
03 }
You create a LINQ query to retrieve a collection of Player objects.
You need to ensure that the collection includes all the players from each team and every league. Which
code segment should you insert at line 02?

• A. var query = leagues.Select(l => l.Teams.Select(t => t.Players));
• B. var query = leagues.SelectMany(l => l.Teams.SelectMany(t => t.Players));
• C. var query = leagues.SelectMany(l => l.Teams.Select(t => t.Players));
• D. var query = leagues.Select(l => l.Teams.SelectMany(t => t.Players));

You use Microsoft Visual Studio 2010 and .NET Framework 4.0 to develop an application that uses the
Entity Framewok.
You need to execute custom logic when an entity is attached to the ObjectContext. What should you do?

• A. Create a partial method named OnAttached in the partial class for the entity.
• B. Create a partial method named OnStateChanged in the partial class for the entity.
• C. Create an event handler to handle the ObjectStateManagerChanged event.
• D. Create an event handler to handle the ObjectMaterialized event.

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

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The application must provide a component part list for any product. The component part list must give the
quantity of
each distinct part that is required to manufacture that product.
You need to create a LINQ expression that delivers a a result of type IEnumerable<Tuple<int,Part>> to
meet the requirements.
Which expression should you use?

• A. IEnumerable<Tuple<int, Part>> result = part.Descendants .Distinct() .GroupBy(p => p) .Select(g => Tuple.Create(g.Count(), g.Key));
• B. IEnumerable<Tuple<int, Part>> result = part.Descendants .ToDictionary(c => c) .Select(d => Tuple.Create(d.Value.Children.Count(), d.Key));
• C. IEnumerable<Tuple<int, Part>> result = part.Descendants .GroupBy(p => p) .Select(g => Tuple.Create(g.Count(), g.Key));
• D. IEnumerable<Tuple<int, Part>> result = part.Children .Distinct() .GroupBy(p => p) .Select(g => Tuple.Create(g.Count(), g.Key));
• E. IEnumerable<Tuple<int, Part>> result = part.Children .GroupBy(p => p) .Select(g => Tuple.Create(g.Count(), g.Key));

You use Microsoft .NET Framework 4.0 to develop an application that uses LINQ to SQL.
The Product entity in the LINQ to SQL model contains a field named Productlmage. The Productlmage field
holds a large amount of binary data.
You need to ensure that the Productlmage field is retrieved from the database only when it is needed by the
application. What should you do?

• A. Set the Delay Loaded property on the Productlmage property of the Product entity to True.
• B. Set the Update Check property on the Productlmage property of the Product entity to Never.
• C. Set the Auto-Sync property on the Productlmage property of the Product entity to Never.
• D. When the context is initialized, specify that the Productlmage property should not be retrieved by using DataLoadOptions

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