单项选择题
You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You add a Web form that contains the following code fragment：
<asp：GridView ID="gvProducts" runat="server" AllowSorting="True" DataSourceID="Products"> </asp：GridView>
<asp：ObjectDataSource ID="Products" runat="server" SelectMethod="GetData" TypeName="DAL" /> </asp：ObjectDataSource>
You write the following code segment for the GetData method of the DAL class：
01 public object GetData（） {
02 SqlConnection cnn = new SqlConnection（ ）
03 string strQuery = "SELECT * FROM Products"；
04 ►
05 }
You need to ensure that the user can use the sorting functionality of the gvProducts GridView control.
Which code segment should you insert at line 04？（）
A.A
B.B
C.C
D.D
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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？（）
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