Large Files in File Upload control taking very long time to send the request

[reza63]

I am implementing progress bar functionality to file upload control, I've noticed is that going into any event handler after browsing to a large file, takes a long time, even if the handler's code has nothing to do with the upload. I'm not really sure how the FileUpload control works, but it seems as if some copying is going on before it even gets to my handler.Can anybody explain me what is happening there and how can i reduce the sending time of post request.