单项选择题

You are creating a Windows Forms Application by using the .NET Framework 3.5.You plan to design a new control that will be used on multiple forms in the app.You need to ensure that the control meets the following requirement：
（1）It retrieves data from a MSSQL Server 2008 database instance.
（2）It uses WPF classes to display data.
（3）It uses user-customizable actions when the control is first painted on the form.
What should you do？（）

A.Create a new custom class for the control that is derived from the Control class.
B.Create a new custom class for the control that is derived from the UserControl class.
C.Create a new custom class for the control that is derived from the ContentControl class.
D.Create a new custom class for the control that is derived from the ContentPresenter class.

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单项选择题

You are creating a Windows Forms Application by using the .NET Framework 3.5.You plan to design a control for the application.You need to ensure that the control meets the following requirements：
（1）Contains the DataGridView， BindingSource， and BindingNavigator controls.
（2）Exposes the properties of the BindingSource control.
（3）Protects the properties of the DataGridView and BindingNavigator controls.
What sholud you do？（）

A.Extend the Control class.
B.Extend the ContainerControl class.
C.Create protected accesses for each control property.
D.Create public accesses for the properties of the BindingSource control.

单项选择题

You are creating a Windows Forms application by using the .Net Framework 3.5 You plan to display detailed help instructions for each control in the form.You create a help file.You configure a HelpProvider component on the form. You need to display the help file for the control that is focused when the F1 key is pressed. Which method of the HelpProvider class should you call for each control？（）

A.SetShowHelp
B.SetHelpString
C.SetHelpKeyword
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多项选择题

You are developing a Windows Forms Application by using the .NET Framework 3.5.You plan to create a customized Print Preview dialog box in the application. You need to ensure that users can preview their documents before printing. Which two actions should you perform？（）

A.Add a PrintPreviewDialog control to the form.
B.Add a PrintPreviewControl control to the form.
C.Create and initialize a PrintDocument object on the form and then implement the PrintPage event handler.
D.Create and initialize a PrintDocument object on the form and then implement the BeginPrint event handler.
E.Set the Document property of the PrintPreviewDialog control to the PrintDocument instance that must be printed.