Parent form closing invoke child form which has background worker in it?

Setting e. Cancel to true is correct. However, once your UpdatingForm closes Application.Exit() fires the mainForm_FormClosing() event again, so you get one more UpdatingForm etc.

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.