怎么实现GirdView1的排序？小弟我指的是后台写的C#代码

DataView objView = new DataView(FileList);   //FileList是结果集DataTableobjView.Sort = "CreateTime DESC";            //CreateTime是结果集中的列GridView1.DataSource = objView;GridView1.DataKeyNames = new string[] { "FileURL" };GridView1.DataBind();
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前台:
HTML code
//设Grid的OnSorting="GridData_Sorting" <asp:TemplateField HeaderText="广告标题" SortExpression="Title">    <ItemTemplate>        <%# Eval("Title")%>    </ItemTemplate></asp:TemplateField>