Catastrophic failure on PropertyChanged

Question

In my Page there is a tabControl with 2 tabItem

and per tabItem contains one textBox yhat binds to Title And Title1 of my SampleData class

SampleData class Impelement InotifyPropertyChanged

I have a button that in button click i change title And title1 of SampleData

this is my code:

    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.RowDefinitions>
            <RowDefinition Height="30"></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Button  Click="Button_Click" >Test</Button>
        <sdk:TabControl  Grid.Row="1">
            <sdk:TabItem Header="Title Tab">
                <TextBox Width="120" Height="30" Text="{Binding Title}"></TextBox>
                
            </sdk:TabItem>
            <sdk:TabItem Header="Title2 Tab">
                <TextBox Width="120" Height="30" Text="{Binding Title2}"></TextBox>
            </sdk:TabItem>
        </sdk:TabControl>

    </Grid>

public class SampleData:INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public int Id { get; set; }
        

        private string _title;

        public string Title
        {
            get { return _title; }
            set { _title = value;
                NotifyPropertyChanged("Title");
            }
        }

        private void NotifyPropertyChanged(string propName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propName));
        }


        private string _title2;

        public string Title2
        {
            get { return _title2; }
            set { _title2 = value; NotifyPropertyChanged("Title2"); }
        }


    }

public partial class MainPage : UserControl
    {
        private SampleData s;
        public MainPage()
        {
            InitializeComponent();

            s = new SampleData {Id=1,Title = "Title1",Title2 = "Title2"};
            LayoutRoot.DataContext = s;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            s.Title += "1";
            s.Title2 += "2";
        }
    }

when selectedTabItem is tab2  silverlight exceprtion raise on

s.Title += "1";

the exception is 


{System.Exception: Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))
   at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.SetValue(IManagedPeerBase obj, DependencyProperty property, String s)
   at MS.Internal.XcpImports.SetValue(IManagedPeerBase doh, DependencyProperty property, Object obj)
   at System.Windows.DependencyObject.SetObjectValueToCore(DependencyProperty dp, Object value)
   at System.Windows.DependencyObject.SetEffectiveValue(DependencyProperty property, EffectiveValueEntry& newEntry, Object newValue)
   at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
   at System.Windows.DependencyObject.RefreshExpression(DependencyProperty dp)
   at System.Windows.Data.BindingExpression.SendDataToTarget()
   at System.Windows.Data.BindingExpression.SourcePropertyChanged(PropertyPathListener sender, PropertyPathChangedEventArgs args)
   at System.Windows.PropertyPathListener.ReconnectPath()
   at System.Windows.Data.Debugging.BindingBreakPoint.<>c__DisplayClass4.<BreakOnSharedType>b__3()}


my page flowdirection is RightToLeft
when i change flowdirection to lefttoright  exception not happen

my sampe code

Answer 1

Make sure you have Silverlight 5.1 runtime.

Answer 2

tanx

Silverlight 5.1 runtime solves my problem