public override void Logout()
 {
     User = null;
 }
        public override void Login(string email, string password)
        {
            if (string.IsNullOrEmpty(email) || string.IsNullOrEmpty(password))
            {
                throw new FilesOnlineException("You must supply both a Login/E-mail and Password.");
            }

            var str = string.Format(Constants.LoginRequest, email, password);
            var request = new HttpRequest(Constants.BoxAPILoginUrl, Proxy)
                              {
                                  ContentType = "text/xml",
                                  PostData = Utils.StrToByteArray(str)
                              };
            var document = new XmlDocument();
            document.Load(request.GetResponse());

            if (Utils.GetNodeTextString(document.SelectSingleNode("//status")).ToLower() != "logged")
            {
                throw new FilesOnlineAuthenticationException(
                    string.Format("Login failed. Response from Box.net was '{0}'",
                                  Utils.GetNodeTextString(document.SelectSingleNode("//status")).ToLower()));
            }

            User = new BoxNetUser
                       {
                           Sid = Utils.GetNodeTextString(document.SelectSingleNode("//user/sid")),
                           AccessId = Utils.GetNodeTextInt(document.SelectSingleNode("//user/access_id")),
                           Email = Utils.GetNodeTextString(document.SelectSingleNode("//user/email")),
                           Free = Utils.GetNodeTextBool(document.SelectSingleNode("//user/free")),
                           Login = Utils.GetNodeTextString(document.SelectSingleNode("//user/login")),
                           SpaceAmount = Utils.GetNodeTextLong(document.SelectSingleNode("//user/space_amount")),
                           SpaceUsed = Utils.GetNodeTextLong(document.SelectSingleNode("//user/space_used")),
                           UserId = Utils.GetNodeTextInt(document.SelectSingleNode("//user/user_id"))
                       };
        }