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

1. Refer to the following lines in the case study: PA40 in \Model\Part.cs, PR16 in\Model\Product.cs, and CT14 in \Model\Component.cs
The application must create XML files that detail the part structure for any product. The XML files must use the following format:
<?xml version="1.0" encoding="utf-8"?>
<product name="Brush" description="Brush product" productType="1">
<component name="Handle" description="Handle" partType="2">
<component name="Screw" description="Screw" partType="3">
<component name="Wood" description="Wooden shaft" partType="45">
</component>
<component name="Head" description="Head" partType="5">
<component name="Screw" description="Screw" partType="3">
<component name="Bristles" description="Bristles" partType="4">
</component> </product>
You need to update the application to support the creation of an XElement object having a structure that will
serialize to the format shown above.
What should you do? (Each correct answer presents part of the solution. Choose two.)

A) Insert the following code segment at line PR16 in \Model\Product.cs:
return new XElement("product, new XAttribute("name", this.Name),
new XElement("description", this.Description),
new XElement("productType", this.ProductType));
B) Insert the following code segment at line CT14 in \Model\Component.cs:
return new XElement("component, new XAttribute("name", this.Name),
new XElement("description", this.Description),
new XElement("partType", this.PartType));
C) Insert the following code segment at line PR16 in \Model\Product.cs:
return new XElement("product, new XElement("name", this.Name),
new XElement("description", this.Description),
new XElement("productType", this.ProductType));
D) Insert the following code segment at line CT14 in \Model\Component.cs:
return new XElement("component, new XElement("name", this.Name),
new XElement("description", this.Description),
new XElement("partType", this.PartType));
E) Insert the following code segment at line CT14 in \Model\Component.cs:
return new XElement("component, new XAttribute("name", this.Name),
new XAttribute("description", this.Description),
new XAttribute("partType", this.PartType));
F) Insert the following code segment at line PR16 in \Model\Product.cs:
return new XElement("product, new XAttribute("name", this.Name),
new XAttribute("description", this.Description),
new XAttribute("productType", this.ProductType));

2. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application. The application contains the following code segment. (Line numbers are included for reference only.)
01 class DataAccessLayer
02 {
03 private static string connString;
04 ...
05 ...
06 public static DataTable GetDataTable(string command){
07 ...
08 ...
09 }
10 }
You need to define the connection life cycle of the DataAccessLayer class.
You also need to ensure that the application uses the minimum number of connections to the database.
What should you do?

A) Insert the following code segment at line 04.
private SqlConnection conn = new SqlConnection(connString);
public void Open()
{
conn.Open();
}
public void Close()
{
conn.Close();
}
B) Replace line 01 with the following code segment.
class DataAccessLayer : IDisposable
Insert the following code segment to line 04.
private SqlConnection conn = new SqlConnection(connString);
public void Open()
{
conn.Open();
}
public void Dispose()
{
conn.Close();
}
C) Insert the following code segment at line 04.
private static SqlConnection conn = new SqlConnection(connString);
public static void Open()
{
conn.Open();
}
public static void Close()
{
conn.Close();
}
D) Insert the following code segment at line 07:
using (SqlConnection conn = new SqlConnection(connString))
{
conn.Open();
}

3. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create a Windows Communication Foundation (WCF) Data Services service. The solution contains the projects shown in the following table.

The WCF data service exposes an Entity Framework model. You need to Access the service by using a
WCF Data Services client.
What should you do in the Application.Client Project?

A) Add a referance to the Application.Model Project.
B) Add a service reference that uses the URL of the WCF data service.
C) Add a referance to the Application.Service Project.
D) Add a web reference that uses the URL of the WCF data service.

4. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that
connects to a Microsoft SQL Server 2008 database.
You use the ADO.NET Entity Framework Designer to model entities. You add the following stored
procedure to the database, and you add a function import to the model.
CREATE PROCEDURE [dbo].[InsertDepartment] @Name nvarchar(50), @ID int NULL OUTPUT
AS INSERT INTO Department (Name) VALUES (@Name) SELECT @ID = SCOPE_IDENTITY()
You need to insert a new department and display the generated ID. Which code segment should you use?

A) using (SchoolEntities context = new SchoolEntities())
{
var id = context.InsertDepartment("Department 1", null);
Console.WriteLine(id);
}
B) using (SchoolEntities context = new SchoolEntities())
{
var id = new ObjectParameter("ID", null));
context.InsertDepartment("Department 1", id);
Console.WriteLine(id.Value);
}
C) using (SchoolEntities context = new SchoolEntities())
{
var id = new ObjectParameter("ID", typeof(int));
context.InsertDepartment("Department 1", id);
Console.WriteLine(id.Value);
}
D) using (SchoolEntities context = new SchoolEntities())
{
ObjectParameter id = null;
context.InsertDepartment("Department 1", id);
Console.WriteLine(id.Value);
}

5. You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You use the ADO.NET Entity Framework to model your entities.
You use Plain Old CLR Objects (POCO) entities along with snapshot-based change tracking. The code
accesses the POCO entities directly.
You need to ensure that the state manager synchronizes when changes are made to the object graph.
Which ObjectContext method should you call?

A) Refresh
B) SaveChanges
C) DetectChanges
D) ApplyPropertyChanges

Solutions: