You are developing an application to update a user's 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 (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);
  }
• B. 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);
  }
• C. 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);
  }
• D. 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);
  }

You are creating a Windows Communication Foundation (WCF) service. You do not want to expose the internal implementation at the service layer. You need to expose the following class as a service named Arithmetic with an operation named Sum. public class Calculator {
public int Add(int x, int y)
{
}
}
Which code segment should you use?

• A. [ServiceContract(Name="Arithmetic")] public class Calculator {
  [OperationContract(Name="Sum")]
  public int Add(int x, int y)
  {
  ...
  }
  }
• B. [ServiceContract(ConfigurationName="Arithmetic")] public class Calculator {
  [OperationContract(Action="Sum")]
  public int Add(int x, int y)
  {
  ...
  }
  }
• C. [ServiceContract(Name="Arithmetic")] public class Calculator {
  [OperationContract(ReplyAction="Sum")]
  public int Add(int x, int y)
  {
  ...
  }
  }
• D. [ServiceContract(Namespace="Arithmetic")] public class Calculator {
  [OperationContract(Action="Sum")]
  public int Add(int x, int y)
  {
  ...
  }
  }

You are implementing an ASP.NET AJAX page that contains two div elements. You need to ensure that the
content of each div element can be refreshed individually, without requiring a page refresh.
What should you do?

• A. Add a form and two update panels to the page. Add a script manager to the form. Add a content template to each update panel, and move a div element into each content template.
• B. Add two forms to the page. Add a script manager and an update panel to each form. Add a content template to each update panel, and move each div element into a content template.
• C. Add two forms to the page. Add a script manager and an update panel to each form. Add a content template to each update panel, and move each div element into a content template.
• D. Add a form and two update panels to the page. Add two script managers to the form, one for each update panel. Add a content template to each update panel, and move each div element into a content template.

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application. The application connects to a Microsoft SQL Server 2008 database. The database includes a table named dbo. Documents that contains a column with large binary dat a. You are creating the Data Access Layer (DAL). You add the following code segment to query the dbo.Documents table. (Line numbers are included for reference only.)
01public void LoadDocuments(DbConnection cnx)
02{
03var cmd = cnx.CreateCommand();
04cmd.CommandText = "SELECT * FROM dbo.Documents";
05...
06cnx.Open();
08ReadDocument(reader); }
You need to ensure that data can be read as a stream. Which code segment should you insert at line 07?

• A. var reader = cmd.ExecuteReader(CommandBehavior.Default);
• B. var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess);
• C. var reader = cmd.ExecuteReader(CommandBehavior.KeyInfo);
• D. var reader = cmd.ExecuteReader(CommandBehavior.SchemaOnly);