You are developing a Windows Presentation Foundation (WPF) application.
A custom control has a dependency property that is bound to a property of type Intl6 on a business layer object.
You need to ensure that the bound value always falls within the range of an Int16 value, even if the value that the user enters does not.
What should you do?

• A. Within the Dependency property's metadata, specify a callback for validation.
• B. Within the Dependency property's metadata, specify a callback for coercion.
• C. Register the property type of the Dependency property as Int16.
• D. Specify code in the common language runtime (CLR) wrapper to adjust the value if it falls outside the range of an Int16 value.

You are developing a Windows Presentation Foundation (WPF) application. You add a TextBox control to the design surface and bind it to an underlying window resource named dsGiftCertificate. The control uses the binding XAML as follows.
<Binding Source="{StaticResource dsGiftCertificate}"
UpdateSourceTrigger = "LostFocus" Path="Coupon" />
You need to provide a custom error message in the tooltip of the TextBox when the user leaves the textbox.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

• A. Implement the INotifyPropertyChanged interface. Use the indexer for the custom
  validation and error message.
• B. Update the binding source as follows.
  <Binding Source="{StaticResource dsGiftCertificate}" UpdateSourceTrigger="Explicit"
  Path="Coupon"ValidatesOnDataErrors="True" />
• C. Implement the IDataErrorlnfo interface. Use the indexer for the custom validation and
  error message.
• D. Update the binding source as follows.
  <Binding Source="{StaticResource dsGiftCertificate}" UpdateSourceTrigger="LostFocus"
  Path="Coupon"ValidatesOnDataErrors="True" />

You develop a Windows Presentation Foundation (WPF) application. This application is used to output data trends to customer service representatives.
You use threading to keep the UI responsive. You have a function named UpdateUI that updates all of the UI components.
You use the following code to update the _Data variable. (Line numbers included for reference only.)

You need to update the user interface without knowing if you are on the UI thread.
Which code segment should you insert at line 06?

• A. If (Me.Dispatcher.CheckAcce33()) Then
  Dim [function] = New Action(Addre33Cf UpdateUI)
  Dim args() As Object = Nothing
  Me.Dispatcher.Beginlnvoke([function], args)
  Else
  UpdateUI()
  End If
• B. Me. Dispatcher.VerifyAccess ()
  UpdateUI()
• C. Me.Dispatcher.VerifyAccess()
  Dim [function] = New Action(AddressCf UpdateUI)
  Dim args() As Object = Nothing
  Me .Dispatcher .BeginlnvoJce ([function], args)
• D. If (Me. Dispatcher. CheckAccess())
  Then UpdateUI()
  Else
  Dim (function] = New Action(AddressCf OpdateUI)
  Dim args() As Object = Nothing
  Me .Dispatcher ,BeginInvoIce ( [function; , args)
  End If

You are developing a Windows Presentation Foundation (WPF) application.
You pull employee information from an XML file named EmployeeData.xml. The XML file is as follows.

You need to display all the employee information from the XML file in EmployeeList. Which markup segment should you use?

• A. <ListBox.Resources>
  <XmlDataProvider x:Key="FeedData" Source="EmployeeData.xml'' XPath="/Employees"
  />
  </ListBox.Resources>
• B. <Window. Resources>
  <XmlDataProvider x:Key=FeedData" Source="EnployeeData.xml" XPath="/Employees" />
  </Window.Resources>
• C. <Window. Resources>
  <XmlDataProvider x:Key="FeedDoca" Source="EmployeeData.xml"
  XPath="/Employees/Employee"/>
  </Window.Resources>
• D. <ListBox.Resources>
  <XmlDataProvider x:Key="FeedData" Source="EmployeeData.xml"
  XPath="/Employees/Employee"/>
  </ListBox.Resources>

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You write the following code fragment.

You need to implement the MyProject.MyConverter class.
What should you do?

• A. Inherit from the TypeConverter class.
• B. Implement the IMultiValueConverter interface.
• C. Apply the TypeConverterAttribute attribute.
• D. Implement the IValueConverter interface.