When trying to process the uploaded files for the RadAsyncUploader control I am getting an error "The device is not ready".

Does anyone have any ideas as to what may be causing this?

For Each file As Telerik.Web.UI.UploadedFile In Me.Uploader.UploadedFiles
 
                Dim targetFile = String.Format("{0}\{1}", targetFolder, file.GetName)
                file.SaveAs(targetFile)
 
            Next

I am using the latest version of the AsyncUploader control.
targetFile is a validly formed filename and the user has write access to the target folder.

Hi Geoff,

This faced error suggests that the uploaded file is being used by another application. Do you open it from the Temporary Folder at the time when UploadedFile event is fired? file.SaveAs() method moves uploaded file from the Temporary to the Target folder and if the uploaded file is locked you may got this error.

All the best,
Hristo Valyavicharski
the Telerik team