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Exam Code: 70-516
Exam Name: TS: Accessing Data with Microsoft .NET Framework 4
Certification Provider: Microsoft
Corresponding Certifications: MCPD, MCPD: Web Developer 4, MCPD: Windows Developer 4, MCTS, MCTS: Microsoft .NET Framework 4, Data Access
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QUESTION 101
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.
You need to create a Plain Old CLR Object (POCO) class that can be used with the ObjectContext.CreateObject method to create a proxy.
What should you do?
A. Create a custom data class that has a Protected constructor that does not have parameters.
B. Create a custom data class in which all properties and methods are virtual.
C. Create a custom data class that is abstract.
D. Create a custom data class that is sealed.
Answer: A
Explanation:
Requirements for Creating POCO Proxies
(http://msdn.microsoft.com/en-us/library/dd468057.aspx)
QUESTION 102
You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an ASP.NET Web application that uses the Entity Framework.
The build configuration is set to Release.
The application must be published by using Microsoft Visual Studio 2010, with the following requirements:
– The database schema must be created on the destination database server.
– The Entity Framework connection string must be updated so that it refers to the destination database server.
You need to configure the application to meet the requirements.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
A. Generate the DDL from the Entity Framework Designer and include it in the project.
Set the action for the DDL to ApplicationDefinition.
B. Set Items to deploy in the Package/Publish Web tab to All files in this Project Folder for the
release configuration.
C. Use the web.config transform file to modify the connection string for the release configuration.
D. Include the source database entry in the Package/Publish SQL tab and update the connection
string for the destination database.
Answer: CD
QUESTION 103
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.
You need to retrieve an entity, and you must ensure that the entity is loaded in a detached state.
Which MergeOption enumeration value should you use to retrieve the entity?
A. PreserveChanges
B. OverwriteChanges
C. AppendOnly
D. NoTracking
Answer: D
Explanation:
AppendOnly-Objects that do not exist in the object context are attached to the context. If an object is already in the context, the current and original values of object’s properties inthe entry are not overwritten with data source values.
The state of the object’s entry and state of properties of the object in the entry do not change.
AppendOnly is the default merge option.
OverwriteChanges-Objects that do not exist in the object context are attached to the context. If an object is already in the context, the current and original values of object’s properties in the entry are overwritten with data source values.
The state of the object’s entry is set to Unchanged, no properties are marked as modified. PreserveChanges-Objects that do not exist in the object context are attached to the context.
If the state of the entity is Unchanged, the current and original values in the entry are overwritten with data source values.
The state of the entity remains Unchanged and no properties are marked as modified. If the state of the entity is Modified, the current values of modified properties are not overwritten with data source values.
The original values of unmodified properties are overwritten with the values from the data source.
NoTracking-Objects are maintained in a Detached state and are not tracked in the ObjectStateManager.
However, Entity Framework-generated entities and POCO entities with proxies maintain a reference to the object context to facilitate loading of related objects.
MergeOption Enumeration
(http://msdn.microsoft.com/en-us/library/system.data.objects.mergeoption.aspx)
QUESTION 104
How do you define a WCF Data Service query to grab the first 10 records.
Options are something like:
A. DataServiceQuery<Order> selectedOrders = context.Orders.AddQueryOption(“$top”, “10”);
B. DataServiceQuery<Order> selectedOrders = context.Orders.AddQueryOption(“$filter”, “10”);
C. DataServiceQuery<Order> selectedOrders = context.Orders.AddQueryOption(“$select”,
“10”);
D. DataServiceQuery<Order> selectedOrders = context.Orders.AddQueryOption(“$expand”,
“10”);
Answer: A
Explanation:
Accessing Data Service Resources (WCF Data Services)
(http://msdn.microsoft.com/en-us/library/dd728283.aspx)
DataServiceQuery<TElement>.AddQueryOption Method
(http://msdn.microsoft.com/en-us/library/cc646860.aspx)
QUESTION 105
There are Entities-States Class, Cities class.
Deleting of state id raises exception.
Which of the following?
A. EntityException
B. ConstraintException
C. UpdateException
D. EntityUpdateException
Answer: B
Explanation:
ConstraintException Represents the exception that is thrown when attempting an action that violates a constraint.
System.Object
System.Exception
System.SystemException
System.Data.DataException
System.Data.ConstraintException
EntityException Represents Entity Framework-related errors that occur in the EntityClient namespace.
The EntityException is the base class for all Entity Framework exceptions thrown by the EntityClient.
System.Object
System.Exception
System.SystemException
System.Data.DataException
System.Data.EntityException
System.Data.EntityCommandCompilationException
System.Data.EntityCommandExecutionException
System.Data.EntitySqlException
System.Data.MappingException
System.Data.MetadataException
System.Data.ProviderIncompatibleException
UpdateException
The exception that is thrown when modifications to object instances cannot be persisted to the data source.
System.Object
System.Exception
System.SystemException
System.Data.DataException
System.Data.UpdateException
System.Data.OptimisticConcurrencyException
EntityException Class
(http://msdn.microsoft.com/en-us/library/system.data.entityexception.aspx)
ConstraintException Class
(http://msdn.microsoft.com/en-us/library/system.data.constraintexception.aspx)
UpdateException Class
(http://msdn.microsoft.com/en-us/library/system.data.updateexception.aspx)
QUESTION 106
Class Workflow-Has Workstepflow inside.
Get workflow data as well as related workstepflow.
A. context.CreateObjectSet<WorkFlow>(“WorkFlowSteps” .
Where(i)WorkFlowSteps == workflow.WorkFlowSteps);
B. context.LoadProperty(workFlow,”WorkFlow”)
C. context.CreateObjectSet<WorkFlowSteps>(WorkFlow .
Where(i)WorkFlow == workflow);
D. context.LoadProperty(workflow Function(i)WorkFlowSteps)
Answer: B
Explanation:
Syntax in A und C stimmt nicht ganz
QUESTION 107
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”, node.FirstAttribute.Value);
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”).Value = node.FirstAttribute.Value;
D. XDocument document = XDocument.Load(“books.xml”);
var query = from node in document.DescendantNodes()
where node.ToString() == “book”
select new XElement(“BookTitle”, node.ToString());
Answer: A
QUESTION 108
You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to develop an application that uses the Entity Framework.
The application has the entity model shown in the following diagram.
The application must create a projection of the unique set of names and year-to-date sales for territories where at least one sales person had sales last year of more than $100,000.
The projection must consist of properties named Sales and Name.
You need to write a query that will generate the required projection.
Which code segment should you use?
A. (from person in model.SalesPersons
where (person.SalesLastYear > 100000)
select new {
Name = person.SalesTerritory.Name,
Sales = person.SalesTerritory.SalesYTD
}
).Distinct();
B. (from person in model.SalesPersons
where (person.SalesLastYear > 100000)
select new {
Name = person.SalesTerritory.Name,
Sales = person.SalesTerritory.SalesYTD
}
);
C. model.SalesTerritories.
Where( t => t.SalesPersons.Any( p => p.SalesLastYear > 100000))
.Select( t=> new { t.Name, t.SalesYTD})
.Distinct();
D. model.SalesTerritories.
Where( t=> t.SalesPersons.Any( p => p.SalesLastYear > 100000))
.Select( t=> new { t.Name, Sales = t.SalesYTD});
Answer: A
QUESTION 109
You use Microsoft .NET Framework 4 to develop an application that connects to a Microsoft SQL Server 2008 database.
You add the following stored procedure to the database.
CREATE PROCEDURE [dbo].[InsertTag]
@Name nvarchar (15)
AS
INSERT INTO [dbo].[Tags] (Name) VALUES(@Name)
RETURN @@ROWCOUNT
You need to invoke the stored procedure by using an open SqlConnection named conn.
Which code segment should you use?
A. SqlCommand cmd = new SqlCommand(“EXEC InsertTag”, conn);
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue(“@Name”, “New Tag 1”);
cmd.ExecuteNonQuery();
B. SqlCommand cmd = new SqlCommand(“EXEC InsertTag”, conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue(“@Name”, “New Tag 1”);
cmd.ExecuteNonQuery();
C. SqlCommand cmd = new SqlCommand(“InsertTag”, conn);
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue(“@Name”, “New Tag 1”);
cmd.ExecuteNonQuery();
D. SqlCommand cmd = new SqlCommand(“InsertTag”, conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue(“@Name”, “New Tag 1”);
cmd.ExecuteNonQuery();
Answer: D
Explanation:
http://msdn.microsoft.com/en-us/library/yy6y35y8(v=vs.71).aspx
QUESTION 110
You use Microsoft .NET Framework 4 to develop an application that connects to a Microsoft SQL Server 2008 database.
The database contains a ClassStudent table that contains the StudentID for students who are enrolled in the classes.
You add the following stored procedure to the database.
CREATE PROCEDURE [dbo].[GetNumEnrolled]
@ClassID INT,
@NumEnrolled INT OUTPUT
AS BEGIN
SET NOCOUNT ON
SELECT @NumEnrolled = COUNT(StudentID)
FROM ClassStudent
WHERE (ClassID = @ClassID)
END
You write the following code. (Line numbers are included for reference only.)
01 private int GetNumberEnrolled(string classID)
02 {
03 using (SqlConnection conn = new SqlConnection(GetConnectionString())
04 {
05 SqlCommand cmd = new SqlCommand(“GetNumEnrolled”, conn);
06 cmd.CommandType = CommandType.StoredProcedure;
07 SqlParameter parClass = cmd.Parameters.Add(“@ClassID”, SqlDbType.Int, 4, “classID”);
08 SqlParameter parNum = cmd.Parameters.Add(“@NumEnrolled”, SqlDbType.Int);
09 …
10 conn.Open()
11 …
12 }
13 }
You need to ensure that the GetNumberEnrolled method returns the number of students who are enrolled for a specific class.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
A. Insert the following code at line 09.
parNum.Direction = ParameterDirection.Input;
B. Insert the following code at line 09.
parNum.Direction = ParameterDirection.Output;
C. Insert the following code at line 11.
int numEnrolled = 0;
SqlDataReader reader = cmd.ExecuteReader();
while(reader.Read())
{
numEnrolled = numEnrolled + (int)cmd.Parameters[“@NumEnrolled”].Value;
}
return numEnrolled;
D. Insert the following code at line 11.
cmd.ExecuteNonQuery();
return (int)parNum.Value;
Answer: BD
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