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

1. A Windows Communication Foundation (WCF) service has the following contract.
[ServiceContract] public class ContoaServicea { [OperationContract] [TransactionFlow(TransactionFlowOperation. Mandatory)]
[OperationBehavior(TraisactionScopeRequired true,
TransactionAutoCorrolete = false)
void TxOp 1 (string value) { ) [OperationCortract(lsTerminating-true)J
[TransactionFlow(TransactionFlowOption Mandatory)] [OperationBehavior(TraisactionScopeRequired true,
TransationAutoCormplete = false)]
void TxOp2(string value) {.. OperationContext. Current. SetTransactionCompleteO;
)
)
The rvice and the clients that call the service use NetTcpBinding with transaction flow enabled
You need to configure the service so that when TxOpl and TxOp2 are invoked under the same client session, they run under the same transaction context.
What should you do?

A) Update the service contract to read as follows.
(ServiceContract(SessionMode SessionMode Required)J Add the following behavior to the
service implementation
[ServiceBehavior(lnstanceCoritextMode = Instance ContextMode. PerSession)]
B) Update the service contract to read as follows.
[ServiceContract(SessionMode = SessionMode.Required)]Md the following behavior to the
service implementation.
[ServiceBehavior(lnstanceContextMode = lnstanceContextMode. PerCall)]
C) Update the service contract to read as follows.
[ServiceContract(SessionMode = SessionModeAllowed)] Add the following behavior to the
service implementation.
[ServiceBehavior(LnstanceContextMode = Instance ContextMode Single,
ReleaseServicelnstanceQnTransactionComplete false)]
D) Update the service contract to read as follows
[ServiceContract(SessionMode = SessionMode.Allowed)] Add the following behavior to the
service implementation.
[ServiceBehavior(lnstanceContextMode Instance ContextMode. Single)]

2. DRAG DROP
You have a client application that consumes a Windows Communication Foundation (WCF) service. The service contains a class named RegistrationService. The RegistrationService class contains two methods named SubmitRegistration and GetRegistrations.
The service has the following requirements:
- The client application must call the SubmitRegistration method synchronously.
- The client application must call the GetRegistrations method asynchronously.
You need to complete the client-side code to call the WCF service.
Which six code segments should you use in sequence? (To answer, move the appropriate six code segments from the list of code segments to the answer area and arrange them in the correct order.)

3. You are modifying an existing Windows Communication Foundation (WCF) service that is defined as follows;

SubmitOrder makes a call to another service.
The ProcessMessage method does not perform as expected under a heavy load you need to enable processing of multiple messages.
New messages must only be processed when the ProcessMessage method is not processing requests, or when it is waiting for calls to SubmitOrder to return.
Which attribute should you apply to the MessageProcessor class?

A) ServiceBehavior (Conc urrencyMode: =Conc urrencyMode. Reentrant)
B) CallbackBehavior (ConcurrencyMode: ConcurrencyMode Reentrant)
C) CallbackBehavior (ConcurrencyMode:=ConcurrencyModeMuttiple)
D) ServiceBehavior (ConcurrencyMode ConcurrencyMode Multiple)

4. You are developing a Windows Communication Foundation (WCF) service.
One of the service operations contains the following code.
private static int counter = 0;
[OperationContract]
public void IncrementCount()
[
counter++;
}
You need to set a service behavior that prevents two or more threads from incrementing the counter variable at the same time.
Which code segment should you use to set the service behavior?

A) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Single)]
B) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.PerSession,
ConcurrencyMode = ConcurrencyMode.Single)]
C) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Hultiple)]
D) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.PerCall,
ConcurrencyMode = ConcurrencyMode.Reentrant)]

5. DRAG DROP
You use Visual Studio to develop a Windows Communication Foundation (WCF) service. The service is not hosted.
You cannot use the WcfTestClient.exe tool to test the service.
You need to test the service from a separate Visual Studio solution that contains a simple console application.
Which four actions should you perform in sequence? (To answer, move the appropriate four actions from the list of actions to the answer area and arrange them in the correct order.)

Solutions: