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 two
ObjectContext instances named context1 and context2.
You need to persist the changes in both object contexts within a single transaction. Which code segment
should you use?

A) using (TransactionScope scope = new TransactionScope())
{
context1.SaveChanges();
context2.SaveChanges();
}
B) using (TransactionScope scope = new TransactionScope())
{
context1.SaveChanges();
context2.SaveChanges();
scope.Complete();
}
C) using (TransactionScope scope = new TransactionScope()) { using (TransactionScope scope1 = new TransactionScope (TransactionScopeOption.RequireNew)) {
context1.SaveChanges();
}
using (TransactionScope scope2 = new TransactionScope
(TransactionScopeOption.RequireNew))
{
context2.SaveChanges();
}
}
D) using (TransactionScope scope = new TransactionScope()) { using (TransactionScope scope1 = new TransactionScope (TransactionScopeOption.RequireNew))
{
context1.SaveChanges();
scope1.Complete();
}
using (TransactionScope scope2 = new TransactionScope
(TransactionScopeOption.RequireNew))
{
context2.SaveChanges();
scope2.Complete();
}
scope.Complete();
}

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

3. You use Microsoft .NET Framework 4.0 to develop an application that connects to a local Microsoft SQL
Server 2008 database.
The application can access a high-resolution timer. You need to display the elapsed time, in sub-
milliseconds (<1 millisecond),
that a database query takes to execute. Which code segment should you use?

A) Stopwatch sw = new Stopwatch(); sw.Start() ; command.ExecuteNonQuery(); sw.Stop(); Console.WriteLine("Time Elapsed: {0:N} ms", sw.Elapsed.Milliseconds);
B) int Start = Environment.TickCount; command.ExecuteNonQuery(); int Elapsed = (Environment.TickCount) - Start; Console.WriteLine("Time Elapsed: {0:N} ms", Elapsed);
C) Stopwatch sw = Stopwatch.StartNew(); command.ExecuteNonQuery() ; sw.Stop() ; Console.WriteLine("Time Elapsed: {0:N} ms", sw.Elapsed.TotalMilliseconds);
D) DateTime Start = DateTime.UtcNow; command.ExecuteNonQuery(); TimeSpan Elapsed = DateTime.UtcNow - Start; Console.WriteLine("Time Elapsed: {0:N} ms", Elapsed.Milliseconds);

4. 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 need to ensure that the model and mapping files are not deployed as application resources. What
should you do?

A) Modify the connection string in the application's .config file to refer to the absolute physical path to the .edmx file.
B) Set the value of the .edmx file's Build Action property to Copy to Output.
C) Modify the connection string in the application's .config file to refer to the relative path to the .edmx file.
D) Set the value of the .edmx file's Metadata Artifact Processing property to Copy to Output Directory.

5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create a Windows
Communication Foundation (WCF) Data Services service.
You discover that when an application submits a PUT or DELETE request to the Data Services service, it
receives an error.
You need to ensure that the application can access the service. Which header and request type should you
use in the application?

A) an HTTP ContentType header as part of a POST request
B) an X-HTTP-Method header as part of a GET request
C) an HTTP ContentType header as part of a GET request
D) an X-HTTP-Method header as part of a POST request

Solutions: