Use FileSystemWatcher to track changes to the file and only then open the file to check for the new lines.
Reopening, Seek() to the old position and continue work should be your best option. If you want other parties to be able to continue accessing the file, just specify proper flags for FileShare e.g. FileShare.ReadWrite.
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.