System.NullReferenceException was unhandled” in a WCF object?

This can not be done that way. First of all, the Callback Channel is only available within an operation, not when the instance of the service class is created.

Try putting that line in the class constructor.

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.