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

1. A Windows Communication Foundation (WCF) solution exposes the following service over a TCP binding. (Line numbers are included for reference only.)

MessageDatabase supports a limited number of concurrent executions of its methods.
You need to change the service to allow up to the maximum number of executions of the methods of MessageDatabase. This should be implemented without preventing customers from connecting to the service.
What should you do?

A) Add a throttling behavior to the service, and configure the maxConcurrentCalls.
B) Add a throttling behavior to the service, and configure the maxConcurrentSessions.
C) Change the service behavior as follows. <ServiceBehavior(ConcurrencyMode:=ConcurrencyMode.Single, InstanceContextMode:=InstanceContextMode.PerSession)>
D) Change the service behavior as follows.
<ServiceBehavior(ConcurrencyMode:=ConcurrencyMode.Multiple, InstanceContextMode:=InstanceContextMode.Single)>

2. A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients.
(Line numbers are included for reference only.)
01 [ServiceContract]
02public interface ITeamMessageService
03{
04 [OperationContract]
05string GetMessage0;
07 [OperationContract]
08void PutMessage(string message);
09)
The code for the service class is as follows
10 public class TeamMessageService: ITeamMessageService
1 1{
12Guid key = GuicLNewGuidO;
1 3string message = "Today's Message":
1 4public string GetMessage()
i5{
16 return stringFormat("Message:{0} Key:{1}",
message, Key);
1n
1 9public void PutMessage(string message)
20{
2lthismessage = message;
22}
23)
The senvice is self-hosted. The hosting code is as follows.
24 ServiceHost host =
25BasicHttpBinding binding =
new BasicHttpBinding(BasicHttpSecuntyMode.None):
26 host AddServiceEndpoint(
HMyApplication lTeamMessageService, binding,
"http:/Ilocalhost: 12345w);
27 host Open0;)
You need to ensure that all clients calling GetMessage will retrieve the same string, even if the message is updated by clients calling PutMessage
What should you do?

A) Redefine the message string in line 13, as follows
static string message = 'Today's Message":
Then change the implementation of PutMessage in lines 19-22 to the following
public void PutMessage(string message) { TeamMessageServicemessage message,
}
B) Add the following attribute to the TeamMessageService class, before line 10.
[ServiceBehavior(lnstanceContextMode = lnstanceContextModePerSession)J Then
change the binding definition on the service at line 25, and on the client to the following
WSHttpBinding binding new
WSHttpBinding(SecurityModeNone);
binding ReliableSession. Enabled true;
C) Add the following attribute to the TeamMessageService class, before line 10.
[ServiceBehavior(lnstanceContextMode = lnstanceContextMode. Single)]
D) Pass a service instance to the instancing code in line 24, as follows.
ServiceHost host = new ServiceHost(new TeamMessageServiceO);

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

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) Add a DataProtectionPermission attribute to the CreditCardNumber property and set the ProtectData property to true.
B) Implement the CreditCardNumber property getter and setter In the setter, run the value of the CreditCardNumber through the MD5CryptoServiceProvider class TransformBlock method
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 contains the following operation contract.
[OperationContract]
CustomerNames GetCustomerNames();
The operation returns customer names.
You need to develop a definition for the operation contract that produces XML with the following structure.

Which code segment should you use?

A) [MessageBodyMember]
public string[] Names;
}
B) [DataMember(IsRequired = false)]
public string[] Names;
}
C) [DataContract]
public class CustomerNames
{
[DataMember]
public string[] Names;
}
D) [MessageContract(WrapperName = "")]
public class CustomerNames
{
E) [DataContract]
public class CustomerNames
{
F) [MessageContract(IsWrapped = false)]
public class CustomerNames
{
[MessageBodyMember]
public string[] Names;
}

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