单项选择题
You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.
You write the following code fragment.
You need to ensure that when you click the Button1 control, a selected list of items move from the ListBox1 control to the ListBox2 control.
Which code segment should you use?（）
A.
B.
C.
D.
E.
F.
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You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You derive a new validation control from the BaseValidator class. The validation logic for the control is implemented in the Validate method in the following manner. Protected Overloads Function Validate( _ ByVal value As String) As Boolean ... End Function You need to override the method that validates the value of the related control. Which override method should you use?（）
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