Grid Sorting Image ...

<asp:GridView ID="grdItemSearch" CssClass="grdTabel" Width="100%"  AllowSorting="true"   AllowPaging="true"
                                               PageSize="10" runat="server" AutoGenerateColumns="False">
                                               <Columns>
                                                   <asp:TemplateField ItemStyle-HorizontalAlign="Left"   SortExpression="ItemCode" HeaderText="Item Code"
                                                       HeaderStyle-Width="20%" ItemStyle-Width="20%">
                                                       <ItemTemplate>
                                                           <asp:Label ID="lblItemCode" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"ItemCode")%>'></asp:Label>
                                                       </ItemTemplate>
                                                   </asp:TemplateField>
                                                   <asp:TemplateField HeaderStyle-Width="60%"   SortExpression="ItemName" ItemStyle-Width="40%"
                                                       HeaderText="Item Name">
                                                       <ItemTemplate>
                                                           <asp:Label ID="lblItemName" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"ItemName")%>'></asp:Label>
                                                       </ItemTemplate>
                                                   </asp:TemplateField>
                                                   <asp:TemplateField HeaderStyle-Width="20%" ItemStyle-Width="20%" HeaderText="Action">
                                                       <ItemTemplate>
                                                           <asp:LinkButton ID="lnkEdit" CommandName="Modify" CommandArgument='<%#DataBinder.Eval(Container.DataItem,"ItemCode")%>'
                                                               runat="server">Edit</asp:LinkButton>
                                                           &nbsp;<asp:LinkButton ID="lnkDel" CommandName="Del" CommandArgument='<%#DataBinder.Eval(Container.DataItem,"ItemCode")%>'
                                                               runat="server">Delete</asp:LinkButton>
                                                       </ItemTemplate>
                                                   </asp:TemplateField>
                                               </Columns>
                                           </asp:GridView>