Add a 'Submit' button just after the DataForm in MainPage.xaml by adding the following code.

<StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Margin="0,12,0,0">
  <Button x:Name="submitButton" Width="75" Height="23"  Content="Submit"  Margin="4,0,0,0" Click="submitButton_Click"/>
</StackPanel>

Handle the button click event in MainPage.xaml.cs by adding the following code:

private void submitButton_Click(object sender, RoutedEventArgs e)
        {
            EmployeeDataSource.SubmitChanges();
        }

Build and run the application. If you now edit data in the form and click the submit button the data in Virtuoso will be updated.

Figure2.184..NET RIA Services Application