单项选择题
You are creating a Windows Forms application by using the .NET Framework 3.5. You create a new form in the application.You add a ContextMenuStrip control named dctxMenu to the form. You have a user defined class named CustomControl.You write the following code segment in the application （Line numbers are included for reference only ）
CustomControl myControl = new CustomControl（）；
You need to ensure that an instance of CustomControl is displayed on the form as a toplevel item of the ctxMenu control.
Which code segment should you add？（）
A.A
B.B
C.C
D.D
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YouarecreatingaWindowsapplicationbyusingthe.NETFramework3.5.YoucreateaninstanceoftheBackgroundWorkercomponentnamedbackgroundWorker1toasynchronouslyprocesstimeconsumingreportsintheapplication.Youwritethefollowingcodesegmentintheapplication（Linenumbersareincludedforreferenceonly.） Youneedtowriteacodesegmentthatreportstotheapplicationwhenthebackgroundprocessdetectsanyofthefollowingactions： （1）Anexceptionisthrown （2）Theprocessiscancelled （3）Theprocessissuccessfullycompleted Whichcodesegmentshouldyouinsert？（）
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