How to display changes to a file that is constantly updated?

Question

C++ / C#

There is a log file from the game. Messages from the chat get into it and the logs are resaved accordingly. It is necessary to write a method that will add new messages from the logs to the ListBox without having to reopen the file. How to implement it?

Answer 1

No way. If working with files, then the file must be opened / closed to update the data.
If you need up-to-date information at every moment of time, then you need to use other means. Databases, sockets, queues and more