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Microsoft TS: Microsoft .NET Framework 3.5 C Windows Communication Foundation Sample Questions:

1. You are creating a Windows Communication Foundation client application by using Microsoft .NET Framework 3.5.
You add the following code segment to a service contract.
[ServiceContract]
interface IDocumentService
{
[OperationContract]
int DeleteDocument(int id);
}
The DeleteDocument method in the service contract takes a long time to execute.
The client application stops responding until the method finishes execution.
You write the following code segment to create an instance of a service proxy in the client application.
(Line numbers are included for reference only.)
01 static void Main() 02 {
03 DocumentServiceClient client= new DocumentServiceClient();
05 }
06 static void ProcessDeleteDocument(IAsyncResult result)
07 {
06 ...
09 }
You need to ensure that the service methods are called asynchronously.
What should you do?

A) Insert the following code segment at line 04:
client.BeginDeleteDocument(20, ProcessDeleteDocument, client);
Insert the following code segment at line 06:
int count=(result.AsyncState as Documentserviceclient).EndDeleteDocument(null);
B) Insert the following code segment at line 04:
client.BeginDeleteDocument(20, ProcessDeleteDocument, client);
Insert the following code segment at line 06:
int count=(result.AsyncState as Documentserviceclient).EndDeleteDocument(result);
C) Insert the following code segment at line 04:
client.BeginDeleteDocument(20, ProcessDeleteDocument, client);
Insert the following code segment at line 06:
result.AsyncWaitHandle.WaitOne();
int count=(result as Documentserviceclient).EndDeleteDocument(result)
D) Insert the following code segment at line 04:
IAsyncresult result = client.BeginDeleteDocument(20, ProcessDeleteDocument, client);
int count=client.EndDeleteDocument(result);
Insert the following code segment at line 06:
result.AsyncWaitHandle.WaitOne();

2. You create a Windows Communication Foundation service by using Microsoft .NET Framework 3.5. You create the following service contract.
[ServiceContract]
public interface IMath
{
[OperationContract]
int Add(int num1, int num2);
}
You need to add an operation contract to perform the Add operation asynchronously. Which operation contract should you use?

A) [OperationContract(AsyncPattern=true)]IAsyncResult BeginAdd(int num1, int num2,
AsyncCallback cb,
object state);int EndAdd(IAsyncResult res);
B) [OperationContract]IAsyncResult BeginAdd(int num1, int num2);[OperationContract]int EndAdd (IAsyncResult res);
C) [OperationContract]int BeginAdd(int num1, int num2, AsyncCallback cb, object state);IAsyncResult EndAdd ();
D) [OperationContract(AsyncPattern=true)]IAsyncResult BeginAdd(int num1, int num2);int EndAdd (IAsyncResult res);

3. You create a Windows Communication Foundation (WCF) service by using Microsoft .NET Framework 3.5. Client applications that run on different platforms access the WCF service.
These applications transmit confidential data to the WCF service. You write the following binding configuration.
....
<binding name="TransportSecurity" >
<security mode="Transport" />
</binding>
...
You need to configure the service for optimum interoperability and optimum security.
Which code fragment should you use?

A) Option D
B) Option A
C) Option C
D) Option B

4. You are creating a Windows Communication Foundation distributed application by using Microsoft .NET Framework 3.5. You write the following code segment to implement the service contract. (Line numbers are included for reference only.)

You need to ensure that the client applications of only those users who belong to the Administrators group can access the RemoveOrder method.
Which code segment should you insert at line 05?

A) Option D
B) Option A
C) Option C
D) Option B

5. You are creating a client application by using Microsoft .NET Framework 3.5. The application will be accessible on the Internet.
You plan to use the wsHttpBinding binding by using HTTPS. The Windows Communication Foundation (WCF) service is hosted by a Windows service. You associate the HTTPS port of the WCF server with an X.509 certificate.
You need to ensure that the client application trusts and validates the certificate.
What should you do?

A) Subscribe to the ServerCertificateValidationCallback event of the System.Net.ServicePointManager class.
Write the validation code in the boolValidate(object sender, X509Certificate cert, X509Chain chain. System.Net.Security.SslPolicyErrors error) event handler on the client side.
B) Subscribe to the ServerCertificateValidationCallback event of the System.Net.ServicePointManager class.
Write the validation code in the boolValidate(object sender, X509Certificate cert, X509Chain chain. System.Net.Security .SslPolicyErrors error) event handler on the server side.
C) Derive a class from the System.IdentityModel.Selectors.X509CertificateValidator class.
Create an instance of the derived class on the client side.
Write the validation code in the public override void Validate(X509Certificate2 certificate) method.
D) Derive a class from the System.IdentityModel.Selectors.X509CertificateValidator class.
Create an instance of the derived class on the server side.
Write the validation code in the public override void Validate(X509Certificate2 certificate) method.

Solutions: