How to locate the source of a binding error?

Question

How can I figure out what line of xaml contains the troublesome binding When my debug output is full of lines like the following:

System.Windows.Data Error: 5

Answer 1

I have been happily using the wonderful snippet from 'Switch on the Code' to detect and report binding errors since it was first published in 2009...

http://www.switchonthecode.com/tutorials/wpf-snippet-detecting-binding-errors

edit: still works excellently on VS2012 (Sept 2013)

Update 25 Jan 2016

The link appears broken, so I'll paste in the relevant snippets...

using System.Diagnostics;
using System.Text;
using System.Windows;

namespace SOTC_BindingErrorTracer
{
    public class BindingErrorTraceListener : DefaultTraceListener
    {   //http://www.switchonthecode.com/tutorials/wpf-snippet-detecting-binding-errors
        private static BindingErrorTraceListener _Listener;
        public static void SetTrace()
        { SetTrace(SourceLevels.Error, TraceOptions.None); }
        public static void SetTrace(SourceLevels level, TraceOptions options)
        {
            if (_Listener == null)
            {
                _Listener = new BindingErrorTraceListener();
                PresentationTraceSources.DataBindingSource.Listeners.Add(_Listener);
            }
            _Listener.TraceOutputOptions = options;
            PresentationTraceSources.DataBindingSource.Switch.Level = level;
        }
        public static void CloseTrace()
        {
            if (_Listener == null)
            { return; }
            _Listener.Flush();
            _Listener.Close();
            PresentationTraceSources.DataBindingSource.Listeners.Remove(_Listener);
            _Listener = null;
        }
        private StringBuilder _Message = new StringBuilder();
        private BindingErrorTraceListener()
        { }
        public override void Write(string message)
        { _Message.Append(message); }
        public override void WriteLine(string message)
        {
            _Message.Append(message);

            var final = _Message.ToString();
            _Message.Length = 0;

            MessageBox.Show(final, "Binding Error", MessageBoxButton.OK,
              MessageBoxImage.Error);
        }
    }
}

And to set it up/initialize it...

namespace WpfListeningForTraceErrors
{
    /// 

    /// Interaction logic for Window1.xaml
    /// 
    public partial class Window1 : Window
    {
        public Window1()
        {
            BindingErrorTraceListener.SetTrace();
            InitializeComponent();
        }
    }
}