Authentication information is handled via the HttpWebRequest.Credentials property. You can set this to either an instance of NetworkCredential or CredentialCache. See the help under these two classes. If your using Windows authentication (typically only in a corproate intranet scenario) this works to provide the credentials the current use is logged in with: request.Credentials = System.Net.CredentialCache.DefaultCredentials; Burt Harris

You could give a string as parameter to the path of the file when calling a webservice method (eg. DownloadFile("C:\\blah.exe") ).. That method just reads the file you specified into a byte[] and returns that. Then it would be the best to write a client which you run, and which allows you to specify the path and write the byte[] to a file so you actually saved the file. Ofcourse, if you do it exactly like this, you can download like everything, but I think thats another question ;).