Use the C1GalleryExtender to display images and their thumbnails. With C1GalleryExtender you can preview the thumbnails and get details of the item from the frame of the gallery.
C1GalleryExtender Markup
The following markup creates a C1GalleryExtender control. Set the TargetControlID property to attach the extender to a control.
<cc1:C1GalleryExtender ID="Panel1_C1GalleryExtender" runat="server" TargetControlID="Panel1" ThumbnailDirection="After">
</cc1:C1GalleryExtender>