how can I transfer a file using TCP packet by packet (regardlless the packet size)? how can I transfer a file using UDP packet by packet (regardlless the packet size)? or on another mean how can I do the folloing: J.U.S.T

Project Description Write a client/server application implementing a shared directory at the server. The server keeps a directory of files (a folder) where the users can upload or download files. When the user connects to the server, he/she selects either to download a file or to upload one. If the user wants to download a file, the server will show a list of the files found in the shared directory, and the user will select one of them and download it. If the user selects to upload a file, the user will select the file and send it to the server, the server will store the file in the shared directory and make it available to the later download requests. using c# J.U.S.T -- modified at 5:15 Monday 17th April, 2006