SummaryValidation - Entity Framework in Silverlight

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Silverlight

validation

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My DomainService_db_SINHVIEN.metadata.cs at Sever side

private SINHVIENMetadata()
            {
            }
            public int ID { get; set; }
            [CustomValidation(typeof(StudentValidation),"CheckMaSV")]
            public string MASV { get; set; }
            [Required(ErrorMessage="Please typing here")]
            [CustomValidation(typeof(StudentValidation),"CheckTenSV")]
            public string TENSV { get; set; 

My StudentValidation.shared.cs at Server side

public static ValidationResult CheckMaSV(string description, ValidationContext context)
        {
            //Validation Logic 
            if (String.IsNullOrEmpty(description))
            {
                ValidationResult ErrorMasv = new ValidationResult("This need some infomation", new string[] { context.MemberName });
                return ErrorMasv;
            }
            if (description == "SVxxx")
            {
                ValidationResult ErrorMasv = new ValidationResult("Masv can't be SVxxx", new string[] { context.MemberName });
                return ErrorMasv;
            }
            
            //return Validation Success if dont have error


            return ValidationResult.Success;
        }

        public static ValidationResult CheckTenSV(string text, ValidationContext context)
        {
            
            if (text == "Tenxxx") 
            {
                ValidationResult ErrorTenSV = new ValidationResult("TenSV can't be Tenxxx",new string[] { context.MemberName });
                return ErrorTenSV;
            }
            
            return ValidationResult.Success;
        }

I have Form InfoSINHVIEN at Client side:

DomainService_db_SINHVIEN _service = new DomainService_db_SINHVIEN();
        public InfoSinhVien()
        {
            InitializeComponent();
        }
       
        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            
            LoadOperation<SINHVIEN> _SinhViens = _service.Load(_service.GetSINHVIENsQuery());
            //Bind to dataGrid
            dG_InfoSV.ItemsSource = _SinhViens.Entities;
        }

        private void btn_Sua_Click(object sender, RoutedEventArgs e)
        {
            if (dG_InfoSV.SelectedItem != null)
            {
                //Creating a new object of Popup
                Child_Nhap_SV chldWind = new Child_Nhap_SV();
                //Getting the GridLayout Control of the popUp To Be Shown
                ((Grid)chldWind.FindName("LayoutRoot")).DataContext = dG_InfoSV.SelectedItem;
                //Add a Event Handaler Which will Execute the Submit The Changes  made to entity Assigned
                chldWind.Closed += new EventHandler(chldWind_Closed);
                chldWind.Show();
            }
            else{
                MessageBox.Show("Chose item to Update!!!");
            }
        }

        public void chldWind_Closed(object sender, EventArgs e) 
        {
            ChildWindow chldWind = (ChildWindow)sender;
            if ((chldWind.DialogResult == true))
            {
                _service.SubmitChanges
                    (
                    result => 
                        {
                            MessageBox.Show("Update Successs!!!");
                            dG_InfoSV.ItemsSource = _service.SINHVIENs; 
                        }, null
                    );
            }
            else
                _service.RejectChanges();
        }

XAML:

<Grid x:Name="LayoutRoot" removed="White">
        <sdk:DataGrid AutoGenerateColumns="True" Height="145" HorizontalAlignment="Left" Margin="129,158,0,0" Name="dG_InfoSV" VerticalAlignment="Top" Width="706" />
        <Button Content="Sửa" Height="23" HorizontalAlignment="Left" Margin="507,71,0,0" Name="btn_Sua" VerticalAlignment="Top" Width="75" Click="btn_Sua_Click" />     
    </Grid>

and last i have ChildForm

<Grid x:Name="LayoutRoot" Margin="2" BindingValidationError="LayoutRoot_BindingValidationError" >
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <Button x:Name="CancelButton" Content="Cancel" Click="CancelButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,0,0" Grid.Row="1" />
        <Button x:Name="OKButton" Content="OK" Click="OKButton_Click" Width="75" Height="23" HorizontalAlignment="Right" Margin="0,12,79,0" Grid.Row="1" />
        <TextBlock Height="23" HorizontalAlignment="Left" Margin="46,40,0,0" Name="textBlock1" Text="Mã sinh viên:" VerticalAlignment="Top" />
        <TextBlock Height="23" HorizontalAlignment="Left" Margin="50,91,0,0" Name="textBlock2" Text="Tên sinh viên:" VerticalAlignment="Top" />
        <TextBox Text="{Binding MASV, Mode=TwoWay,ValidatesOnDataErrors=True,ValidatesOnExceptions=True,ValidatesOnNotifyDataErrors=True}" Height="23" HorizontalAlignment="Left" Margin="135,36,0,0" Name="txt_MaSV" VerticalAlignment="Top" Width="120" />
        <TextBox Text="{Binding TENSV, Mode=TwoWay,ValidatesOnDataErrors=True,ValidatesOnExceptions=True,ValidatesOnNotifyDataErrors=True}" Height="23" HorizontalAlignment="Left" Margin="135,87,0,0" Name="txt_TenSV" VerticalAlignment="Top" Width="120" />
        <input:ValidationSummary Name="_ValidationSum" Margin="46,120,0,0" HorizontalAlignment="Left" Width="291" />
    </Grid>

When i type something to test at ChildForm, ValidationError is shown at Textbox have Error. But i dont see where's my SummaryValidation. How can i do next? Hope all you help me!! Im new Silverlighter