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？（）