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

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
The application connects to a Microsoft SQL Server 2008 database.
The database includes a database table named ProductCatalog as shown in the exhibit:

You add the following code segment to query the first row of the ProductCatalog table. (Line numbers are included for reference only.)
01 using(SqlConnection cnx = new SqlConnection(connString)
02 {
03 var command = cnx.CreateCommand();
04 command.CommandType = CommandType.Text;
05 command.CommandText = "SELECT TOP 1 * FROM dbo.ProductCatalog";
06 cnx.Open();
07 var reader = command.ExecuteReader();
08 if (reader.Read())
09 {
10 var id = reader.GetInt32(0);
11 ...
12 reader.Close();
13 }
14 }
Which answer belongs in line 11?

A) var weight = reader.GetDouble(1); var price = reader.GetDecimal(2); var status = reader.GetBoolean(3);
B) var weight
= reader.GetFloat(1); var price = reader.GetDecimal(2); var status = reader.GetByte(3);
C) var weight = reader.GetFloat(1); var price = reader.Doublel(2); var status = reader.GetByte(3);
D) var weight = reader.GetDouble(1); var price = reader.GetFloat(2); var status = reader.GetBoolean(3);

3. You use Microsoft .NET Framework 4.0 to develop an application that connects to a Microsoft SQL Server
2008 database.
The application uses nested transaction scopes. An inner transaction scope contains code that inserts
records into the database.
You need to ensure that the inner transaction can successfully commit even if the outer transaction rolls
back.
What are two possible TransactionScope constructors that you can use for the inner transaction to achieve
this goal?
(Each correct answer presents a complete solution. Choose two.)

A) TransactionScope(TransactionScopeOption.Required)
B) TransactionScope()
C) TransactionScope(TransactionScopeOption.Suppress)
D) TransactionScope(TransactionScopeOption.RequiresNew)

4. 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 has two DataTable objects that reference the Customers and Orders tables in the
database.
The application contains the following code segment. (Line numbers are included for reference only.)
01 DataSet customerOrders = new DataSet();
02 customerOrders.EnforceConstraints = true;
03 ForeignKeyConstraint ordersFK = new ForeignKeyConstraint("ordersFK",
04 customerOrders.Tables
["Customers"].Columns["CustomerID"],
05 customerOrders.Tables["Orders"].Columns
["CustomerID"]);
06 ...
07 customerOrders.Tables["Orders"].Constraints.Add(ordersFK);
You need to ensure that an exception is thrown when you attempt to delete Customer records that have related Order records.
Which code segment should you insert at line 06?

A) ordersFK.DeleteRule = Rule.Cascade;
B) ordersFK.DeleteRule = Rule.SetNull;
C) ordersFK.DeleteRule = Rule.SetDefault;
D) ordersFK.DeleteRule = Rule.None;

5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
uses the Entity Framework.
Entity types in the model are generated by the Entity Data Model generator tool (EdmGen.exe).
You write the following code. (Line numbers are included for reference only.)
01 MemoryStream stream = new MemoryStream();
02 var query = context.Contacts.Include("SalesOrderHeaders.SalesOrderDetails");
03 var contact = query.Where("it.LastName = @lastname", new ObjectParameter
("lastname", lastName)).First();
04 ....
You need to serialize the contact and all of its related objects to the MemoryStream so that the contact can
be deserialized back into the model.
Which code segment should you insert at line 04?

A) var formatter = new XmlSerializer(typeof(Contact)); formatter.Serialize(stream, contact);
B) var formatter = new BinaryFormatter(); formatter.Serialize(stream, contact);
C) var formatter = new SoapFormatter(); formatter.Serialize(stream, contact);
D) var formatter = new XmlSerializer(typeof(Contact), new Type[] { typeof(SalesOrderHeader), typeof(SalesOrderDetail)
});
formatter.Serialize(stream, contact);

Solutions: