Question

can any one tell me how can we enable/ disable button by radio button in MVVM.

Answer 1

Generally, it does not require view model. You can bind properties of two elements directly by using NotConverter.

[ValueConversion(typeof(bool), typeof(bool))]
public class NotConverter : IValueConverter
{
    public static readonly IValueConverter Instance = new NotConverter();

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        bool typedValue = (bool)value;
        return !typedValue;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return Convert(value, targetType, parameter, culture);
    }

}

< RadioButton Name=radio />
< Button IsEnabled={Binding Path=IsChecked, ElementName=radio, Converter={x:Static ns:NotConverter.Instance}} />