IValueConverter in WPF

Converters are mainly using in WPF when there is a need to convert a value to another value just like converting a Boolean to Visibility.

public class CustomConverter : IValueConverter
  {
      #region IValueConverter Members

      public object Convert(object value, Type targetType, object parameter,
CultureInfo culture)
      {
          if (value ==null)
              return false;
          return true;

      }

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

      #endregion
  }

Here CustomConverter is implementing IValueConverter.We can use this converter in the XAML.First add this Converter in the resources,

<local:CustomConverter x:Key="CustomConverter" />

where local is the reference to the assembly where CustomConverter is defined.

Use this Converter in Controls DataBinding like,

IsEnabled="{Binding ElementName=ListBoxName, Path=SelectedItem,
Converter={StaticResource CustomConverter}}"