Minimum File Size

Demo uploads land in a temporary store and are swept after 60 minutes. To keep files, handle FileUploaded — see Single File for the complete save pattern.

Minimum File Size

Enforce a minimum file size using MinFileSize to reject files that are too small (e.g., empty or placeholder files).

What you should see: files under 10 KB are refused - catches empty and truncated files before storage.

Min 10 KB

Drag & drop files here, or paste from clipboard

<au:AjaxFileUpload ID="Uploader1" runat="server"
 MinFileSize="10KB"
 ButtonText="Select File (min 10KB)"
 AutoUpload="true"
 ShowProgress="true" />

Try selecting a very small file (under 10 KB) to see the validation error.