多項(xiàng)選擇題

You discover that a particular group of settings named UserPreferences changes.You need to store the UserPreference settings to prevent affecting other applications. Which two actions should you perform？（）

A.Use the Properties.USerPreferences object
B.Use the Properties.Settings.Default.Userprefences object
C.Use the ConfigurationManager.AppSettings object during runtime
D.Create the settings by using Application scope
E.Create the settings by using User scope

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You create an isntance of a BackgroundWorker Component named backgroundworker1.You discover that when the application attempts to cancel the background process you get an exception from the following code segment：
backgroundworker1.CancelAsync（）；
You need to configure the BackgroundWorker component appropriately to prevent to application from exception.What should you do？（）

A.Cancel the background process in the backgroundworker1_DoWork event
B.Set the IsBusy property og backgroundworker1 to True before you attempt to cancel
C.Set the WorkerSupportsCancellation property of backgroundworker1 to true before the code
D.Set the DoWorkEventArgs Cancel property to true

單項(xiàng)選擇題

You are creating a Windows Forms application by using the .Net Framework 3.5.You plan to design a composite control for the application.You need to derive the control from a base class that supports templates.What should you do？（）

A.Derive from the Control class.
B.Derive from the UserControl class.
C.Derive from the ScrollableControl class.
D.Derive from the ContainerControl class.

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You discover that a particular group of settings named UserPreferences changes.You need to store the UserPreference settings to prevent affecting other applications. Which two actions should you perform？（）

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You are creating a Windows Forms application by using the .Net Framework 3.5.You plan to design a composite control for the application.You need to derive the control from a base class that supports templates.What should you do？（）

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You discover that a particular group of settings named UserPreferences changes.You need to store the UserPreference settings to prevent affecting other applications. Which two actions should you perform？（）