public class RatingToStringConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            // Validate parameters
            if (!(value is double))
            {
                throw new NotSupportedException("Unsupported value type in RatingToStringConverter.");
            }
            // Convert number to string
            double doubleValue = Math.Floor((double)value);
            if (0.0 == doubleValue)
            {
                return "Awful";
            }
            else if (1.0 == doubleValue)
            {
                return "Poor";
            }
            else if (2.0 == doubleValue)
            {
                return "Fair";
            }
            else if (3.0 == doubleValue)
            {
                return "Good";
            }
            else if (4.0 == doubleValue)
            {
                return "Great";
            }
            else
            {
                throw new ArgumentException("Unsupported value in RatingToStringConverter.");
            }
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }