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

1. You have an existing ContosoEntities context object named context.
Calling the SaveChanges() method on the context object generates an exception that has the following inner exception:
System.Data.SqlClient.SqlException: Cannot insert duplicate key row in object 'dbo.Colors' with unique index 'IX_Colors'.
You need to ensure that a call to SaveChanges() on the context object does not generate this exception. What should you do?

A) Override the SaveChanges() method on the ContosoEntities class, call the ObjectStateManager.GetObjectStateEntries(System.Data.EntityState.Added) method, and call the AcceptChanges() method on each ObjectStateEntry object it returns
B) Add a try/catch statement around every call to the SaveChanges() method.
C) Remove the unique constraint on the Name column in the Colors table.
D) Examine the code to see how Color objects are allocated. Replace any instance of the new Color() method with a call to the ContosoEntities.LoadOrCreate() method.

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application uses the ADO.NET Entity Framework to model entities.
You define a Category class by writing the following code segment. (Line numbers are included for
reference only.)
01 public class Category
02 {
03 public int CategoryID { get; set; }
04 public string CategoryName { get; set; }
05 public string Description { get; set; }
06 public byte[] Picture { get; set; }
07 ...
08 }
You need to add a collection named Products to the Category class. You also need to ensure that the
collection supports deferred loading.
Which code segment should you insert at line 07?

A) public virtual List <Product> Products { get; set; }
B) protected List <Product> Products { get; set; }
C) public static List <Product> Products { get; set; }
D) public abstract List <Product> Products { get; set; }

3. 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 ta = new taStoreTableAdapters.ProductTableAdapter(); var dt = ta.GetData(); var row = dt.Select("680") ; row[0]["Name"] = "New Product Name"; ta.Update(row);
B) 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);
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 row = dt.NewProductRow(); row.ProductID = 680; row.Name = "New Product Name"; dt.Rows.Add(row) ;

4. You use Microsoft Visual Studio 2010, Microsoft Sync Framework, and Microsoft .NET Framework 4.0 to
create an application.
You have a ServerSyncProvider connected to a Microsoft SQL Server database. The database is hosted on
a Web server.
Users will use the Internet to access the Customer database through the ServerSyncProvider.
You write the following code segment. (Line numbers are included for reference only.)
01 SyncTable customerSyncTable = new SyncTable("Customer");
02 customerSyncTable.CreationOption =
TableCreationOption.UploadExistingOrCreateNewTable;
03 ...
04 customerSyncTable.SyncGroup = customerSyncGroup;
05 this.Configuration.SyncTables.Add(customerSyncTable);
You need to ensure that the application meets the following requirements:
-Users can modify data locally and receive changes from the server.
-Only changed rows are transferred during synchronization. Which code segment should you insert at line 03?

A) customerSyncTable.SyncDirection = SyncDirection.Bidirectional;
B) customerSyncTable.SyncDirection = SyncDirection.DownloadOnly;
C) customerSyncTable.SyncDirection = SyncDirection.Snapshot;
D) customerSyncTable.SyncDirection = SyncDirection.UploadOnly;

5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to develop an application. A file named books.xml contains the following XML.
<bib>
<book title="Programming in Unix" year="1992">
<author>Author1</author>
<author>Author2</author>
<author> Author 3 </author>
</book> </bib>
The application must generate an XML result that contains an XML element named BookTitle for each
book. The text content of the element must contain the title of the book.
You need to create a query that generates the new XML result. What should you do?

A) XDocument document = XDocument.Load("books.xml");
var query = from node in document.Descendants()
where node.Name.LocalName == "book"
select new XElement("BookTitle").Value = node.FirstAttribute.Value;
B) XDocument document = XDocument.Load("books.xml");
var query = from node in document.Descendants()
where node.Name.LocalName == "book"
select new XElement("BookTitle", node.FirstAttribute.Value);
C) XDocument document = XDocument.Load("books.xml");
var query = from node in document.DescendantNodes()
where node.ToString() == "book"
select new XElement("BookTitle", node.ToString());
D) XDocument document = XDocument.Load("books.xml");
var query = from node in document.DescendantNodes()
where node.ToString() == "book"
select new XText("BookTitle" + node.ToString());

Solutions: