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Microsoft TS: Windows Communication Foundation velopment with Microsoft .NET Framework 4 Sample Questions:

1. You are developing a Windows Communication Foundation (WCF) service that allows customers to update financial data. The client applications call the service in a transaction. The service contract is defined as follows. (Line numbers are included for reference only.)
01 <ServiceContract()>
02 Public Interface IDatallpdate
03
04 <OperationContract()>
05 <TransactionFlow(TransactionFlowOption.Handatocy)>
06 Sub Update (ByVal accountNumber As String,
ByVal amount As Double)
07
08 End Interface
09
10 Class UpdateService
11 Implements IDataUpdate
12
13 <OperationBehavior(
TransactionScopeRequired:=True, TransactionAutoComplete:=True)>
14 Public Sub Update(ByVal accountNumber As String,
ByVal amount As Double)
Implements IDataUpdate.Update IS
16 Try
17 18 Catch ex As Exception
19 WriteErrorLog(ex) 20
21 End Try
22
23 End Sub
24
25 End Class
Customers report that the transaction completes successfully even if the Update method throws an exception.
You need to ensure that the transaction is aborted if the Update method is not successful.
What should you do?

A) Insert the following line at line 09. <ServiceBehavlor( TransactionAutoCoropleteOnSessionClose:"False) >
B) Insert the following line at line 09. <ServiceBehavior( TransacCionAucoCompleteOnSesslonClose:"True) >
C) insert the following line at line 20. Throw
D) Replace line 13 with the following line. <OperationBehavior( TransactionScopeRequired:MTrue, TransactionAutoComplece:"False)>

2. You develop a Windows Communication Foundation (WCF) service to generate reports. Client applications call the service to initiate report generation but do not wait for the reports to be generated. The service does not provide any status to the client applications.
The service class is defined as follows. (Line numbers are included for reference only.)
01 <ServiceContract()> 02 Public Class ReportGeneratorService 03 04 Private Function GenerateReports( ByVal clientID As Integer) As Integer 05 & 06 Return 0 07 End Function 08 09 End Class
You need to ensure that client applications can initiate reports without waiting for status.
Which two actions should you perform (Each correct answer presents part of the solution. Choose two.)

A) At line 04, change the GenerateReports method from Private to Public.
B) Insert the following code at line 03. <OperationContract(IsOneWay:=True)>
C) Insert the following code at line 03. <OperationContract(AsyncPattern:=False)>
D) Remove line 06. At line 04, change the type of GenerateReports method to Sub. Remove the code As Integer from the method definition.

3. You are developing a data contract for a Windows Communication Foundation (WCF) service.
The data in the data contract must participate in round trips. Strict schema validity is not required.
You need to ensure that the contract is forward-compatible and allows new data members to be added to it.
Which interface should you implement in the data contract class?

A) IExtension<T>
B) IExtensibleDataObject
C) ICommunicationObject
D) IExtensibleObject<T>

4. You are creating a windows Communication Foundation (WCF) service to process orders. The data contract for the order is defined as follows:
[DataContract] public class Order { ... [DataMemberl public string CardHolderName { get; set; [DataMember] public string CreditCardNumber { get; set; } }
You have the following requirements
- Enable the transmission of the contents of Order from the clients to the service. - Ensure that the contents of CreditCardNumber are not sent across the network in clear text. - Ensure that the contents of CreditCardNumber are accessible by the service to process the order.
You need to implement the service to meet these requirements.
What should you do?

A) Implement the CreditCardNumber property getter and setter. In the setter, run the value of the CreditCardNumber through the MD5CryptoServiceProvider class TransformBlock method
B) Add a DataProtectionPermission attribute to the CreditCardNumber property and set the ProtectData property to true.
C) Convert the DataContract to a MessageContract and set the ProtectionLevel property to SignAndEncrypt
D) Change the data type of CreditCardNumber from string to SecureString

5. You are developing a Windows Communication Foundation (WCF) service that returns location information for authorized law enforcement agencies. The service contract is as follows.

Users are authenticated and impersonated. The system uses ASP.NET roles. The members of law enforcement are members of the LawEnforcement role.
You need to ensure that only members of the LawEnforcement role can call these methods.
What are two possible ways to achieve this goal (Each correct answer presents a complete solution? Choose two.)

A) At the beginning of each method, enumerate each ClaimSet in a new WindowsClaimSet. Use the FindClaims method to locate a claim type named Role with a right named LawEnforcement.
B) Use the CurrentPrincipal property of the thread. Call the IsInRole method specifying LawEnforcement as a parameter.
C) Create a GenericPrincipal specifying Thread.CurrentPrincipal.Identity as the IIdentityParameter and LawEnforcement as the only value for the Roles parameter.
D) Add a PrincipalPermissionAttribute to each method that should be available only to members of law enforcement. Set its SecurityAction to Demand and set the role equal to LawEnforcement.

Solutions: