private void  LoadRequest()
        {
            AdministrationServiceClient client = new AdministrationServiceClient(Utility.ProtocoleFacturation(), Utility.EndPoint("Administration"));

            client.LoadRequestCompleted += (ss, res) =>
            {
                if (res.Cancelled || res.Error != null)
                {
                    string error = res.Error.Message;
                    Message.ShowError(error, Galatee.Silverlight.Resources.Langue.errorTitle);
                    return;
                }

                //if (res.Result == null || res.Result.Count == 0)
                //{
                //    Message.ShowInformation(Galatee.Silverlight.Resources.Langue.msgNodata, Galatee.Silverlight.Resources.Langue.informationTitle);
                //    return;
                //}
                //txt_requette.Text = res.Result;
            };
            client.LoadRequestAsync();
        }