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I just can't seem to figure this out. I found some similar Questions here but either I can't figure out the right direction for my approach or I am doing something completly wrong. My Application has a Singleton Class Logger, which saves Log messages from every class in my program. public class Logger { private Logger() { } private static volatile Logger instance; public static Logger GetInstance() { // DoubleLock if (instance == null) { lock (m_lock) { if (instance == null) { instance = new Logger(); } } } return instance; } //Helper for Thread Safety private static object m_lock = new object(); private ObservableCollection<string> _Log; public ObservableCollection<string> Log { get { return _Log; } } public void Add(string text) { if (_Log == null) _Log = new ObservableCollection<string>(); Log.Add(DateTime.Now.ToString() + " " + text); } public void Clear() { _Log.Clear(); } } Now I want to bind Log to ListBox in my MainWindow, but I can't figure out the right Binding <ListBox Name="lstboxLog" Grid.Row="2" Margin="10,0,10,10" ItemsSource="{Binding Source={x:Static tools:Logger.Log}}" Height="100" /> tools is the namespace of the singleton class in my XAML. I'm sure this is simpler than I think, but I am just overlooking something.

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