sorting of gridview with boundfield

Hello guys i have a gridview filled with boundfield like i shown below. 
<asp:GridView ID="GWCase" runat="server" DataKeyNames="detail, propertydetail,suspectdetail " BackColor="#CCCCCC" BorderColor="#999999" BorderStyle="Solid" BorderWidth="3px" CellPadding="4" CellSpacing="2" ForeColor="Black" Width="100%" AutoGenerateSelectButton="True" OnSelectedIndexChanged="GWCase_SelectedIndexChanged" AutoGenerateColumns="False" AllowPaging="True" PageSize="5" OnPageIndexChanging="GWCase_PageIndexChanging"> <FooterStyle BackColor="#CCCCCC" /> <HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" /> <PagerStyle BackColor="#CCCCCC" ForeColor="Black" HorizontalA ...