MIME Type Validation

Validate files by their MIME type using EnableMimeCheck="true". This checks the actual content type rather than just the file extension, providing stronger security.

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<au:AjaxFileUpload ID="Uploader1" runat="server"
 EnableMimeCheck="true"
 AllowedExtensions=".jpg,.png,.gif,.pdf"
 ButtonText="Select File (images/PDF only)"
 AutoUpload="true"
 ShowProgress="true" />

MIME checking verifies the actual file content matches the extension, preventing renamed files from bypassing extension-based validation.