单项选择题
A. Inherit the DependencyObject class.
B. Declare the Speed property as a dependency property.
C. Declare an animation of the Speed property from within the code-behind file.
D. Implement the System.Windows.Media.Animation.IAnimatable interface with the Wheel class.
单项选择题 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? （）
单项选择题 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?（）
单项选择题 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?（）