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

1. You use Microsoft .NET Framework 4.0 to develop an application that connects to a Microsoft SQL Server
2008 database.
The application includes a table adapter named taStore, which has the following DataTable.

There is a row in the database that has a ProductID of 680. You need to change the Name column in the
row to "New Product Name".
Which code segment should you use?

A) var dt = new taStore.ProductDataTable(); var row = dt.NewProductRow(); row.ProductID = 680; row.Name = "New Product Name"; dt.Rows.Add(row) ;
B) var ta = new taStoreTableAdapters.ProductTableAdapter(); var dt = ta.GetData(); var row = dt.Select("680") ; row[0]["Name"] = "New Product Name"; ta.Update(row);
C) var dt = new taStore.ProductDataTable(); var ta = new taStoreTableAdapters.ProductTableAdapter(); ta.Fill(dt); var dv = new DataView(); dv.RowFilter = "680"; dv[0]["Name"] = "New Product Name"; ta.Update(dt);
D) var dt = new taStore.ProductDataTable(); var ta = new taStoreTableAdapters.ProductTableAdapter(); ta.Fill(dt); taStore.ProductRow row = (taStore.ProductRow)dt.Rows.Find(680) ; row.Name = "New Product Name"; ta.Update(row);

2. The database contains orphaned Color records that are no longer connected to Part records.
You need to clean up the orphaned records. You have an existing ContosoEntities context object named
context.
Which code segment should you use?

A) var unusedColors = context.Colors.Where(c => !c.Parts.Any()).ToList(); foreach (var unused in unusedColors){
context.DeleteObject(unused)
}
context.SaveChanges();
B) context.Colors.TakeWhile(c => !c.Parts.Any()); context.SaveChanges();
C) var unusedColors = context.Colors.Where(c => !c.Parts.Any()); context.DeleteObject(unusedColors); context.SaveChanges();
D) context.Colors.ToList().RemoveAll(c => !c.Parts.Any()); context.SaveChanges();

3. Which method will return all nodes of an XDocument?

A) doc.DescendantNodes();
B) doc.GetAllnodes();
C) doc.Descendants();
D) doc.Root.Allnodes();

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You use Plain Old CLR objects (POCO) to model your entities.
The application communicates with a Windows Communication Foundation (WCF) Data Services service.
You need to ensure that entities can be sent to the service as XML. What should you do?

A) Apply the [DataContract(IsReference = false)] attribute to the entities.
B) Apply the [Serializable] attribute to the entities.
C) Apply the [DataContract(IsReference = true)] attribute to the entities.
D) Apply the virtual keyword to the entity properties.

5. You need to write a LINQ query that can be used against a ContosoEntities context object named context to
find all
parts that have a duplicate name. Which of the following queries should you use?
(Each correct answer presents a complete solution. Choose two).

A) context.Parts.Any(p => context.Parts.Any(q => p.Name == q.Name));
B) context.Parts.SelectMany(p => context.Parts.Select(q => p.Name == q.Name && p.Id != q.Id));
C) context.Parts.GroupBy(p => p.Name).Where(g => g.Count() > 1).SelectMany(x => x);
D) context.Parts.Where(p => context.Parts.Any(q => q.Name == p.Name && p.Id != q.Id);

Solutions: