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Using an IValueConverter in a Binding

<UserControl x:Class='SilverlightApplication3.MainPage'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'      xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:d='http://schemas.microsoft.com/expression/blend/2008'      xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'      mc:Ignorable='d'      xmlns:my="clr-namespace:SilverlightApplication3"     d:DesignWidth='640' d:DesignHeight='480'>     <UserControl.Resources>         <my:YesNoValueConverter x:Key="myConverter"></my:YesNoValueConverter>     </UserControl.Resources>     <StackPanel x:Name="LayoutRoot" Background="White">         <TextBox x:Name="myTextBox" Text="{Binding IsCorrect, Converter={StaticResource myConverter}}" />         <Button x:Name="myButton" Content="Bind" Height="30" Width="90" Click="myButton_Click" />     </StackPanel> </UserControl> //File: Page.cs using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace SilverlightApplication3 {     public partial class MainPage : UserControl     {         public MainPage()         {             InitializeComponent();         }         private void myButton_Click(object sender, RoutedEventArgs e)         {             Test test = new Test(true);             LayoutRoot.DataContext = test;         }     }     public class YesNoValueConverter : IValueConverter     {         public object Convert(object value, Type targetType,             object parameter, System.Globalization.CultureInfo culture)         {             bool isYes = Boolean.Parse(value.ToString());             if (isYes == true)                 return "Yes";             return "No";         }         public object ConvertBack(object value, Type targetType,             object parameter, System.Globalization.CultureInfo culture)         {             string boolText = value.ToString().ToLower();             if (boolText == "yes")                 return true;             else if (boolText == "no")                 return false;             else                 throw new InvalidOperationException("Please enter 'yes' or 'no'.");         }     }     public class Test     {         private bool isCorrect = true;         public bool IsCorrect         {             get { return isCorrect; }         }         public Test(bool value)         {             isCorrect = value;         }     } }