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copied!<p>At first you need you class to implement <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged.aspx" rel="noreferrer">INotifyPropertyChanged</a> or a property to be <a href="http://msdn.microsoft.com/en-us/library/system.windows.dependencyproperty.aspx" rel="noreferrer">DependencyProperty</a> for changing property value on textbox text change,</p> <pre><code>namespace WpfApplication1 { public partial class MainWindow : Window, INotifyPropertyChanged { private string _test public string test { get { return _test; } set { _test = value; OnPropertyChanged("test"); } } public MainWindow() { test = "this is a test"; InitializeComponent(); } public event PropertyChangedEventHandler PropertyChanged; private void OnPropertyChanged(String info) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(info)); } } } } </code></pre> <p>Than you can bind to that property by giving name to that window, and using ElementName property like this.</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" Title="MainWindow" Height="350" Width="525" Name="myWindow"> <Window.Resources> <ObjectDataProvider x:Key="test"></ObjectDataProvider> </Window.Resources> <Grid> <TextBlock Height="23" HorizontalAlignment="Left" Margin="108,58,0,0" Name="textBlock1" VerticalAlignment="Top" Text="{Binding ElementName=myWindow, Path=test}" /> </Grid> </code></pre>

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