YouarecreatingaWindowsFormsApplicationbyusingthe.NETFramework3.5.Youplantodesignanewcontrolthatwillbeusedonmultipleformsintheapp.Youneedtoensurethatthecontrolmeetsthefollowingrequirement（1）ItretrievesdatafromaMSSQLServer2008databaseinstance.（2）ItusesWPFclassestodisplaydata.（3）Itusesuser-customizableactionswhenthecontrolisfirstpaintedontheform.Whatshouldyoudo？（）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.

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.

MCPD(70-505)