it doesn't work, so strange...
<CuteWebUI:UploadPersistedFile AutoUseSystemTempFolder="false" runat="server" ID="UploadPhoto1" ItemTextTemplate="" InsertText="上載相片" OnFileUploaded="UploadPhoto_FileUploaded" OnFileChanged="UploadPhoto_FileChanged1">
<ValidateOption AllowedFileExtensions="jpg,jpeg,gif,png" />
<ValidateOption MaxSizeKB="5120" />
</CuteWebUI:UploadPersistedFile>