I really like WPF converters. I often don’t need the ConvertBack method though.
Most programmers deal with this by leaving the NotImplementedException; or they return null.
I also see this method being marked with the [Obsolete()] attribute. I think this totally gives you the wrong impression that it should not be used anymore.
The attribute is used to inform programmers , not the databinding system.
And of course, the method is still valid and might get a different implementation later on.
Check out the Binding.DoNothing (and the DependencyProperty.UnsetValue).
