private void LoginButton_Click(object sender, RoutedEventArgs e) { if(_loadingAnm != null) _loadingAnm.Visibility = Visibility.Visible; SmartMap_DomainContext context = new SmartMap_DomainContext(); LoadOperation loadOp = context.Load<User>(context.GetUserQuery(userNameBox.Text.Trim().ToLower(),passBox.Password),LoginUserLoaded,null); }