What is the use of uploadDataFieldName in upload()

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hi friends,
i not able understand purpose of uploaddatafieldname parameter of upload method.

public function upload(request:urlrequest, uploaddatafieldname:string = "filedata", testupload:boolean = false):void

if file data, how data of file? browse m able file name only. how can convert binary form. how binary contents of file?

plese me regarding this, many days m facing problem in fileupload programs. if has done file upload in servlets or struts using jakarta commons or in way, please guide me.

thanks in advance help



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