woops, just found the answer to question 2/ : return Server.MapPath("/"); I still have question n° 1/. I just can't get the user that executes the webservice. Please help. thx ! don't waste your time, or time will waste you

Hi, Since the calling of the function in web reference is done by the asp.net user, you can't get the exact user. But you can get it in the webform using the code Request.LogonUserIdentity.Name give the exact user who is accessing the page. Request.LogonUserIdentity give the system.security.principal.windowsidentity class object.