YouarecreatingaWindowsFormsapplicationbyusingthe.NETFramework3.5.Youplantodevelopanewcontrolfortheapplication.ThecontrolwillhavethesamepropertiesasaTextBoxcontrol.Youneedtoensurethatthecontrolhasatransparentbackgroundwhenitispaintedonform.Youwanttoachievethisgoalbyusingtheminimumamountofdevelopmenteffort.Whatshouldyoudo？（）A.Create a new class that is derived from the Control class.Call the SetStyle method in the constructor.B.Create a new class that is derived from theTextBox control class.Override the OnPaint method in the constructor.C.Create a new class that is derived from the Control class.Set the BackColor property of the control to Transparent.Call the SetStyle method in the constructor.D.Create a new class that is derived from theTextBox control class.Set the BackColor property of the control to Transparent in the constructor.Call the SetStyle method in the constructor.

单项选择题

You are creating a Windows Forms application by using the .NET Framework 3.5. You plan to develop a new control for the application.The control will have the same properties as a TextBox control.You need to ensure that the control has a transparent background when it is painted on form.You want to achieve this goal by using the minimum amount of development effort.What should you do？（）

A.Create a new class that is derived from the Control class.Call the SetStyle method in the constructor.
B.Create a new class that is derived from theTextBox control class.Override the OnPaint method in the constructor.
C.Create a new class that is derived from the Control class.Set the BackColor property of the control to Transparent.Call the SetStyle method in the constructor.
D.Create a new class that is derived from theTextBox control class.Set the BackColor property of the control to Transparent in the constructor.Call the SetStyle method in the constructor.

MCPD(70-505)