RetroFE/Configuration/Configuration/Converter/NullToVisibilityConverter.cs

using System;
using System.Windows;
using System.Windows.Data;

namespace Configuration.Converter
{
    public class NullToVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter,
            System.Globalization.CultureInfo culture)
        {
            if (targetType != typeof(Visibility))
                throw new InvalidOperationException("The target is not of type bool");

            return ((object)value != null) ? Visibility.Visible : Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter,
            System.Globalization.CultureInfo culture)
        {
            throw new NotSupportedException();
        }

    }
}