Windows Communication Foundation (WCF) application uses a data contract that has several data
members. You need the application to throw a Serialization Exception if any of the data members are not
present when a serialized instance of the data contract is deserialized. What should you do?

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?

You are creating a Windows Communication Foundation (WCF) service that accepts messages from
clients when they are started.
The message is defined as follows.
[MessageContract] public class Agent {
public string CodeName { get; set; }
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public string SecretHandshake { get; set; }
}
You have the following requirements:
“The CodeName property must be sent in clear text.
The service must be able to verify that the property value was not changed after being sent by the client.
“The SecretHandshake property must not be sent in clear text and must be readable by the service.
What should you do?