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copied!<p>Make sure you are setting the Binding Source correctly :</p> <pre><code><Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:WpfApplication1="clr-namespace:WpfApplication1" Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded_1" > <Grid> <TextBlock Text="{Binding XmlContentFile, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="#FFF3A3A3"/> </Grid> </code></pre> <p> and make sure as well you are setting the value of your property in the right place :</p> <pre><code>public partial class MainWindow : Window,INotifyPropertyChanged { private string _xmlContentFile; public string XmlContentFile { get { return _xmlContentFile ; } set { _xmlContentFile = value; OnPropertyChanged("XmlContentFile"); } } public MainWindow() { InitializeComponent(); } private void Window_Loaded_1(object sender, RoutedEventArgs e) { XmlContentFile = "New Value !"; } public event PropertyChangedEventHandler PropertyChanged; protected virtual void OnPropertyChanged(string propertyName) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName)); } } </code></pre> <p>True that this answer is not in MVVM, but that won't need much changings except that you will be needing to set your DataContext to your ViewModel.</p>

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