Two way percentage formatted binding in WPF

Question

I have this textbox:

It correctly displays 0.05 as 5

Answer 1

Adding to ChrisF's answer, the converter I ended up using (only for decimals):

class DecimalPercentageConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter,
                  System.Globalization.CultureInfo culture)
    {
        return value;
    }

    public object ConvertBack(object value, Type targetType, object parameter,
                              System.Globalization.CultureInfo culture)
    {
        if (targetType != typeof(decimal) || value == null)
            return value;

        string str = value.ToString();

        if (String.IsNullOrWhiteSpace(str))
            return 0M;

        str = str.TrimEnd(culture.NumberFormat.PercentSymbol.ToCharArray());

        decimal result = 0M;
        if (decimal.TryParse(str, out result)) {
            result /= 100;
        }

        return result;
    }
}