Question

How can I bind a value of string Y or N to a isEnabled Value?

<TextBox IsEnabled="{Binding Path=StringValueFromSomeEntity, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />

StringValueFromSomeEntity can be a Y or N value.

Answer 1

Use a converter to convert the string to a bool-value:

public class StringToBoolConverter:IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value.ToString().ToLower() == "y")
           return true;
        return false;
    }
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if ((bool)value)
           return "Y";
        return "N";
    }
}

Refer to it in the resources:

<Window.Resources>
    <conv:StringToBoolConverter x:Key="StringToBool"/>
</Window.Resources>

Apply it to your binding (if you just want to change the IsEnabled property according to your string, use Mode=OneWay, but if you really want to bind TwoWay you need the ConvertBack-method):

<TextBox IsEnabled="{Binding Path=StringValueFromSomeEntity, Mode=OneWay, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource ResourceKey=StringToBool}"/>