Concurrent Uploads

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.

Parallel Upload Slots

Upload multiple files simultaneously with configurable concurrency. Three parallel upload slots allow faster overall completion while limiting server load.

What you should see: 3 files uploading at once (adjustable): queue five and watch the fourth wait for a free slot.

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Upload Slots

<au:AjaxFileUpload ID="Uploader1" runat="server"
 AllowMultiple="true"
 ConcurrentUploads="3"
 AutoUpload="true"
 ShowProgress="true" />

// JavaScript API approach
AjaxUploader.create('#uploader', {
 uploadUrl: '/ajaxupload.axd/upload',
 multiple: true,
 maxFiles: 10,
 concurrency: 3, // 3 parallel upload slots
 autoUpload: true,
 onQueueRender: function(queue) {
 // Show active uploads in parallel slots
 }
});