Henrik Soderlund

<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"
             xmlns:local="clr-namespace:SilverlightApplication3"
             mc:Ignorable="d">
    <Grid x:Name="LayoutRoot">

        <Grid.Resources>
@@          <local:StringFormatConverter x:Key="StringFormatConverter"></local:StringFormatConverter>
        </Grid.Resources>

        <TextBox x:Name="TxtSource"
                 Text="$99"
                 Visibility="Collapsed"></TextBox>

        <TextBlock Text="{Binding ElementName=TxtSource,
                        Path=Text,
@@                      Converter={StaticResource StringFormatConverter},
@@                      ConverterParameter='The cost is {0} dollars'}">
        </TextBlock>

    </Grid>
</UserControl>


using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Data;

namespace SilverlightApplication3
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }
    }

    public class StringFormatConverter : IValueConverter
    {
        #region IValueConverter Members

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
@@          return String.Format(parameter.ToString(), value.ToString());
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}