private void Btn_BrowseServiceClick(object sender, RoutedEventArgs e)
        {
            ViewServiceWindow viewService = new ViewServiceWindow(currentUser);

            selectedService = viewService.GetSelectedService();

            if (selectedService != null)
            {
                txtService.Text = selectedService.ServiceName;
            }
        }
        private void btnViewServices_Click(object sender, RoutedEventArgs e)
        {
            ViewServiceWindow vs = new ViewServiceWindow(currentUser);

            vs.ShowDialog();
        }