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

2. You are modifying a Windows Communication Foundation (WCF) service that allows customers to update financial data. The service currently requires a transaction from the client application and is working correctly. The service contract is defined as follows. (Line numbers are included for reference only.)

The service must be modified so that client applications do not need to initiate a transaction when calling the operation. The service must use the client application's transaction if one is available. Otherwise it must use its own transaction.
You need to ensure that the service operation is always executed within a transaction.
What should you do?

A) Replace line 13 with the following code. <OperationBehavior( TransactionScopeRequired:"False, TransactionAutoComplete:-True)>
B) Replace line 05 with the following code. <TransactionFlow( TransactionFlowOption.NotAliowed)>
C) Replace line 05 with the following code. <TransactionFlow( TransactionFlowOption.Allowed) >
D) Replace line 13 with the following code. <OperatlonBehavior( TransaetionScopeRequired:"False, TransactionAutoComplete:"False)>

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 using windows Communication Foundation (WCF) to create a service. You need to implement a custom message-level security binding element Which binding element should you use?

A) SslStreamSecuntyBindingElement
B) TransportSecurityElement
C) HttpsTransportBindingElement
D) WindowsStreamSecurityBindingElement

5. You develop a Window Communication Foundation (WCF) service. You have the following requirements: - Create a data contract to pass data between client applications and the service. - Create the data that is restricted and cannot pass between client applications and
the service. You need to implement the restricted data members. Which member access modifier should you use?

A) Protected
B) Static
C) Private
D) Public

Solutions: