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copied!<p>It works fine by me. The only difference is DataContract tag removed and DataContext assigned. and My sample is following:</p> <pre><code><Window x:Class="_4206499.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="360" Width="578"> <Grid> <TextBox Text="{Binding Path=Description, Mode=TwoWay}" VerticalAlignment="Center" Margin="12,12,286,278" /> <Button Width="100" Margin="57,59,346,219" Click="Button_Click"></Button> </Grid> </code></pre> <p></p> <p>and code behind is</p> <p><code><pre> using System; using System.Windows; using ClassLibrary1;</p> <p>namespace _4206499 { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); Source = new Source(); DataContext = Source; }</p> <pre><code> public Source Source { get; set;} private void Button_Click(object sender, RoutedEventArgs e) { Source.Description = DateTime.Now.ToString(); } } </code></pre> <p>} </pre></code></p> <p>and one from separate class library: <pre><code> using System; using System.ComponentModel;</p> <p>namespace ClassLibrary1 { public class Source : INotifyPropertyChanged { private String _Description;</p> <pre><code> public String Description { get { return _Description; } set { if (_Description == value) return; _Description = value; OnPropertyChanged("Description"); } } public event PropertyChangedEventHandler PropertyChanged; protected virtual void OnPropertyChanged(string propertyName) { PropertyChangedEventHandler handler = this.PropertyChanged; if (handler != null) { var e = new PropertyChangedEventArgs(propertyName); handler(this, e); } } } </code></pre> <p>}</p> <p></pre></code></p>

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