You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You write the following code fragment：  
<asp：DropDownList AutoPostBack="true" ID="DropDownList1" runat="server"   onselectedindexchanged= "DropDownList1_SelectedIndexChanged">  
<asp：ListItem>1</asp：ListItem>  
<asp：ListItem>2</asp：ListItem>  
<asp：ListItem>3</asp：ListItem>  
</asp：DropDownList>   
You also add a MultiView control named MultiView1 to the Web page. MultiView1 has three child View controls. 
You need to ensure that you can select the View controls by using the DropDownList1 DropDownList control.
Which code segment should you use？（）

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You write the following code fragment：  
<asp：ListBox SelectionMode="Multiple" ID="ListBox1" runat="server"> 
</asp：ListBox>  
<asp：ListBox ID="ListBox2" runat="server"> 
</asp：ListBox>  
<asp：Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />   
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？（）