hello everybody

i have a requirement in my applicaiton wherein i have to download x no of files from server to the client machine.all the files have the same extension.the client dose not know the name of the files.i want that when the client clicks on the download button the application connects to the web-server and downloads all files from a particular directory.i also want to get the timestamp of the files on the server and compare them with the timestamp of the files on the client.if there is any change then my application should again download the particular file on my client.plz siggest me how can i do this.if anyone has the code for this then plz send it to me

thanks
parth