Hi, I was wondering if it was possible to read in a file from the client, process it, then write an output file to the client. If so, what would be the best way to do it?no problem, just use the streamwriter and filestream methods of asp.net.Not to be picky, but StreamWriter and FileStream are Classes, not Methods. The important part of his question is how to get the file from the Client. He would need to use the HtmlInputFile Class to do this. Here is an example: http://www.4guysfromrolla.com/webtech/091201-1.shtml