The RadAsyncUpload PostbackTriggers
property that defines the controls that will post-back and eventually upload all currently listed files to the target folder. In other words if there are two buttons on the page which initiate a post-back and only one of them is defined in the RadAsyncUpload PostbackTriggers only this one will post-back the files and clear the file list.Clicking on the second button will initiate a post-back but will retain the files without moving them to the target folder.
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