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Simple enough, with the fileupload control, grab the filesize using, I think, fileupload(whatever the name for your control is, if it was for pics, I would 'id' it as 'fileupload_pics'. so use...

The asp.net file upload control is fully customizable. If you check MSDN, under FileUpload Control, you will see a full list of Methods and all the class details.

The reason why you cannot use that in asp.net is because asp.net does not use the same functionality. I recommend using asp.net's FileUpload control. It is a hell of a lot easier.