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Microsoft TS: Windows Applications Development with Microsoft .NET Framework 4 Sample Questions:

1. You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You add a ListBox control to the application. The ListBox control is data-bound to an instance of a custom collection class of the Product objects named ProductList.
You need to ensure that changes to ProductList are automatically reflected in the ListBox control.
What should you do?

A) Implement the INotifyPropertyChanged interface in the Product class.
B) Extend the DependencyObject class in the Product class.
C) Extend the ObservableCollection<Product> class in the ProductList class.
D) Implement the IQueryable<Product> interface in the ProductList class.

2. You develop a Windows Presentation Foundation (WPF) application. This application is used to output data trends to customer service representatives.
A data trend analysis is performed in a function named UpdateTrendData. The trend analysis is a long-running process.
The application contains the following code segment.
Class MainWindow: Window {
private void UpdateData(object arg)
{
double data = UpdateTrendData();
... } }
UpdateData is currently invoked on the UI thread when the form is first displayed. You need to process the data in a manner that does not cause the UI to freeze. What should you do?

A) Use this.Dispatcher.BeginInvoke to invoke UpdateData passing in the priority of Background.
B) Use ThreadPool.SetMaxThreads(2, 2) and invoke UpdateData.
C) Use this.Dispatcher.Beginlnvoke to invoke UpdateData passing in the priority of Normal.
D) Use ThreadPool.QueueUserWorkItem to invoke UpdateData.

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

4. 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 (this.Dispatcher.CheckAccess() )
UpdateUI ();
}
else
{
var function = new Action(UpdateUI);
this. Dispatcher.ReginInvoice(function, null);
}
B) this.Dispatcher.VerifyAccess();
UpdateUI() ;
C) if (this.Dispatcher. CheckAccess ();
{
var function = new Action (Updated);
this.Dispatcher.ReginInvoke(function, null);
}
else
{ UpdateUI(); }
D) this.Dispatcher.VerifyAccess();
var function = new Action(UpdateUI);
this. Dispatcher.BecginInvoke{function, null);

5. You are developing a Windows Presentation Foundation (WPF) application.
A custom control has a dependency property that is bound to a property of type Int16 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 coercion.
B) Register the property type of the Dependency property as Int 16.
C) within the Dependency property's metadata, specify a callback for validation.
D) Specify code in the common language runtime (CLR) wrapper to adjust the value if it falls outside the range of an Intl6 value.

Solutions: