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- 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?（）
A、 Use a DoubleAnimation class.
B、 Use a Storyboard animation class.
C、 Use the DragDropEffects enumeration.
D、 Use the DragAction enumeration.
- C
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