Why do we need to use ConvertBack in IValue Converter?

I don't use it often, but it's my understanding it's for when a binding updates the source value. Wherever your binding updates the source (on the view model usually), and specifies a converter, it will use ConvertBack.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.