You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. 
You add a property named ServiceContext to a control. 
You need the value of ServiceContext to flow to the child controls exactly like the value of the DataContext property of the FrameworkElement class. 
What should you do? （）

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. 
You create a custom control named Wheel. 
You need to ensure that the Speed property of Wheel can be animated. 
What should you do?（）

You use Microsoft .NET Framework 4 to create a Windows application that can execute on client computers that run Windows Vista. 
You are creating a User Account Control (UAC) application manifest for the application. 
You need to ensure that users who are members of the local Administrators group do not receive a UAC prompt when the application executes. 
Which code fragment should you use? （）

You use Microsoft .NET Framework 4 to create a Windows Forms application.  
The application includes a RichTextBox control and a ListBox control. The ListBox control is populated with a list of valid file names.  
The application allows users to drag a ListBox item to the RichTextBox control. 
You need to provide a visual indication that a file that is dragged can be dropped on the RichTextBox control. 
What should you do?（）

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.  
The application uses the drag-and-drop functionality. 
You need to ensure that the drag-and-drop operation is stopped when a user moves the cursor outside the boundaries of the application form. 
Which enumeration member should you use?（）

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.  
The application uses the background worker process (BWP).  
When the user clicks a button,
the background worker executes a method named DoCalculations asynchronously. 
You need to implement a progress bar on the user interface (UI) that informs the user of the progress of DoCalculations. 
Which two actions should you perform?（）

You use Microsoft .NET Framework 4 to create an application. 
The application performs resource-intensive calculations that consist of multiple layers of nested looping.
The application will be deployed to servers that contain varying hardware configurations. 
You need to ensure that the application utilizes CPU resources on the server in the most efficient manner. 
You want to achieve this goal by using the minimum amount of code. 
What should you do?（）

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create an application.  
The application uses the LINQ ParallelEnumerable.
AsParallel method to perform multiple queries on a database.  
You need to ensure that queries can execute on separate threads concurrently. 
What should you do? （）

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. 
You create a class named Person that has a FirstName property and a LastName property. 
You create a resource that contains a collection of Person objects and assign the family key to it. 
You add a ListBox control by using the following code fragment. (Line numbers are included for reference only.)

You need to ensure that each item in the ListBox control meets the following requirements: 
Contains a TextBox that is data-bound to the FirstName property.  
Contains a TextBox that is data-bound to the LastName property. 
Which code fragment should you insert at line 04?（）

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. 
You declare a class named PictureContainer that has a property named Photo.  
The Photo property is of the byte[] type and contains an image in the JPEG format. 
You assign a collection of the PictureContainer elements to the current DataContext.  
You need to create a ListBox control that displays the images. 
Which code fragment should you use?（）