关于WCF RIA Service 删除操作的有关问题？先多谢了

关于WCF RIA Service 删除操作的问题？请教各位，先谢谢了




[解决办法]

    <Grid x:Name="LayoutRoot" Background="White">
        <Button Content="删除" Height="23" HorizontalAlignment="Left" Margin="12,208,0,0" Name="bt_del" VerticalAlignment="Top" Width="75" Click="bt_del_Click" />        
        <sdk:DataGrid AutoGenerateColumns="True" Height="190" HorizontalAlignment="Left" ItemsSource="{Binding ElementName=movieDomainDataSource, Path=Data}" Margin="12,12,0,0" Name="movieDataGrid" RowDetailsVisibilityMode="VisibleWhenSelected" VerticalAlignment="Top" Width="164"/>
    </Grid>

namespace SLA20131012
{
    public partial class MainPage : UserControl
    {
        private MovieDomainContext movieCtx = new MovieDomainContext();
        
        public MainPage()
        {
            InitializeComponent();

            LoadOperation<Movie> loadMovies = movieCtx.Load(movieCtx.GetMovieQuery());
            loadMovies.Completed += loadMovies_Completed; 
 
        }

        void loadMovies_Completed(object sender, EventArgs e)
        {
            LoadOperation<Movie> temp = (LoadOperation<Movie>)sender;
            movieDataGrid.ItemsSource = temp.Entities;
        }     

        private void bt_del_Click(object sender, RoutedEventArgs e)
        {
            Movie movie = movieDataGrid.SelectedItem as Movie;
            this.movieCtx.Movies.Remove(movie);
            this.movieCtx.SubmitChanges();
        }
    }
}