R – Silverlight – Default Gradient or Effect – How to turn it off

You can throw and capture data validation exceptions.

To manage both of these types of errors need to take 3 steps:

1. Identify the error handler either in the control or higher in the visiblity hierarchy (e.g., a container; in this case the grid that contains the text box)
2. Set NotifyOnValidationError and ValidateOnException to true. The latter tells the Binding Engine to create a validation error event when an exception occurs. The former tells the Binding Engine to raise the BindingValidationError event when a validation error occurs.
3. Create the event handler named in step 1.

Taken from here.

Sample code:

// page.xaml.cs

private bool clean = true;


private void LayoutRoot_BindingValidationError( 
   object sender, ValidationErrorEventArgs e )
{
   if ( e.Action == ValidationErrorEventAction.Added )
   {
      QuantityOnHand.Background = new SolidColorBrush( Colors.Red );
      clean = false;
   }
   else if ( e.Action == ValidationErrorEventAction.Removed )
   {
      QuantityOnHand.Background = new SolidColorBrush( Colors.White );
      clean = true;
   }
}



// page.xaml

<Grid x:Name="LayoutRoot" Background="White" BindingValidationError="LayoutRoot_BindingValidationError" >

<TextBox x:Name="QuantityOnHand"   
    Text="{Binding Mode=TwoWay, Path=QuantityOnHand, 
        NotifyOnValidationError=true,  ValidatesOnExceptions=true }"
    VerticalAlignment="Bottom"
    HorizontalAlignment="Left"
    Height="30" Width="90"red
    Grid.Row="4" Grid.Column="1" />


// book.cs

public int QuantityOnHand
{
   get { return quantityOnHand; }
   set
   {
      if ( value < 0 )
      {
         throw new Exception( "Quantity on hand cannot be negative!" );
      }
      quantityOnHand = value;
      NotifyPropertyChanged( "QuantityOnHand" );
   }       // end set
}

Although still a somewhat immature platform, Silverlight 2.0 supports many of the features that I would expect from a platform needed to create full sized applications.

• Data access through web services and local data/object query support with Linq
• Many feature rich controls such as datagrid, treeview, etc
• A very usable subset of the CLR (common language runtime)
• Access to restricted local storage on the client machine
• It is cross platform
• There are already some great add-ons, like Telerik and the Silverlight Control Toolkit

For your specific scenario, Microsoft has published a tutorial on Multi-page Applications