I would like to hand in my validation class the ItemsSource-object, to check whether the users input (value in handler class) can be found in the list (of ItemsSource)I would like to hand in my validation class the
I would like to hand in my validation class the ItemsSource-object, to check whether the users input (value in handler class) can be found in the list (of ItemsSource)I would like to hand in my validation class the