Name_box_det exists within the ItemTemplate of your ListBox. This is a different context to your page and hence the error. Because an instance of this TextBlock will exist for every item in the collection your there's no way to know which one you're referring to in the code behind.
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.