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

1. 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 05 with the following code. <TransactionFlow( TransactionFlowOption.Allowed) >
B) Replace line 13 with the following code. <OperationBehavior( TransactionScopeRequired:"False, TransactionAutoComplete:-True)>
C) Replace line 05 with the following code. <TransactionFlow( TransactionFlowOption.NotAliowed)>
D) Replace line 13 with the following code. <OperatlonBehavior( TransaetionScopeRequired:"False, TransactionAutoComplete:"False)>

2. You are creating a client application and configuring it to call a Windows Communication Foundation (WCF) service. When the application is deployed, it will be configured to send all messages to a WCF routing service.
You need to ensure that the application can consume the target service after the application is deployed.
What should you do?

A) In the client application, add a service reference to the target service. In the client binding configuration, specify the address of the router service.
B) In the client application, add a service reference to the target service. In the client binding configuration, specify the address of the target service.
C) In the client application, add a service reference to the router service. In the client binding configuration, specify the address of the router service.
D) In the client application, add a service reference to the router service. In the client binding configuration, specify the address of the target service.

3. You are developing an application to update a users social status. You need to consume the service using Windows Communication Foundation (WCF).
The client configuration is as follows.
<system.serviceModel>
<bindings>
<webHttpBinding>
<binding name="SocialConfig">
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Basic"
realm="Social API" />
</security>
</binding>
</webHttpBinding>
</bindings>
<client>
<endpoint address="http://contoso.com"
binding="webHttpBinding"
bindingConfiguration="SocialConfig"
contract="ISocialStatus"
name="SocialClient" />
</client>
</system.serviceModel>
The service contract is defined as follows.
[ServiceContract] public interface ISocialStatus {
[OperationContract]
[WebInvoke(UriTemplate =
"/statuses/update.xml?status={text}")]
void UpdateStatus(string text);
}
Which code segment should you use to update the social status?

A) using (WebChannelFactory<ISocialStatus> factory =
new WebChannelFactory<ISocialStatus>(typeof(ISocialClient)))
{
factory.Credentials.Windows.ClientCredential.UserName =
user.Name;
factory.Credentials.Windows.ClientCredential.SecurePassword.
SetAt(0, Convert.ToChar(user.Password) );
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus); }
B) using (ChannelFactory<ISocialStatus> factory =
new ChannelFactory<ISocialStatus>("POST"))
{
factory.Credentials.Windows.ClientCredential.UserName =
user.Name;
factory.Credentials.Windows.ClientCredential.SecurePassword.
SetAt(0, Convert.ToChar(user.Password) );
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus); }
C) using (ChannelFactory<ISocialStatus> factory =
new WebChannelFactory<ISocialStatus>(typeof(ISocialStatus)))
{
factory.Credentials.UserName.UserName = user.Name;
factory.Credentials.UserName.Password = user.Password;
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus);
}
D) using (WebChannelFactory<ISocialStatus> factory =
new WebChannelFactory<ISocialStatus>("SocialClient"))
{
factory.Credentials.UserName.UserName = user.Name;
factory.Credentials.UserName.Password = user.Password;
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus);
}

4. 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) Option B
B) Option D
C) Option C
D) Option A

5. You are developing a Windows Service. The Windows Service will host a Windows Communication Foundation (WCF) service.
The Windows Service class will inherit from ServiceBase.
You need to ensure that the WCF service starts when the Windows Service is restarted.
What should you do in the Windows Service class?

A) Override the OnStart method and create and open a new ServiceHost.
Override the OnStop method and close the ServiceHost.
B) Override the OnContinue method and open a new ServiceHost.
Override the OnStop method and close the ServiceHost.
C) Create a public method named Main.
Create a new ServiceHost in the Main method.
Override the OnShutdown method and close the ServiceHost.
D) Override the OnPowerEvent method and open a new ServiceHost.
Override the OnShutdown method and close the ServiceHost.

Solutions: