單項(xiàng)選擇題

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

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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.

單項(xiàng)選擇題

You are creating a Windows Forms Application by using the .NET Framework 3.5.Users use the application to process and approve invoices. A list of recently accessed invoices is stored in the users settings section of the App.config file.You need to maintain the list of invoices from the last persisted state.What should you do？（）

A.Use the Properties.Settings object during runtime.
B.Use the Properties.Settings.Default object during runtime.
C.Use the ConfigurationManager.AppSettings object during runtime.
D.Use the ConfigurationManager.GetSection method during runtime.

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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 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？（）