Figure 11. The GridView Theme has Been Added to the App_Theme Folder

Rename the GridView Theme to DataWebControls (right-click on the GridView folder in the App_Theme folder and choose Rename). Next, enter the following markup into the GridView.skin file:

<asp:GridView runat="server" CssClass="DataWebControlStyle">
   <AlternatingRowStyle CssClass="AlternatingRowStyle" />
   <RowStyle CssClass="RowStyle" />
   <HeaderStyle CssClass="HeaderStyle" />   
</asp:GridView>