A simple drag-and-drop zone using the EnableDropZone property.
Drop files onto the area to begin uploading.
What you should see: a drop zone that accepts dragged files and doubles as a click-to-browse button, so there is always a keyboard path.
Drag & drop files here, or paste from clipboard
<au:AjaxFileUpload ID="Uploader1" runat="server"
AllowMultiple="true"
ButtonText="Drop files here or click to browse"
ShowProgress="true"
EnableDropZone="true" />