Text file based DataBase

Hello, I'm writing a small app to test the text based database concept. The small app is attached. I already implemented some commands: - Previous: show the previous register; - Next: show the next register; - Load: open the text file and fill the list; - New: clear the current form to write a new register; - Save: save the new register. What I need: - Implement an index for each register (Current ID label); - Implement a register counter (Registers label); - Currently, the save button only save a new register. I need a function to save the current register after changes - maybe an update button; - Implement a delete register (Del button) - The index will be unique for each register, and never will be repeated, even after a delete command. Note: I'll only release the milestones after tested. Happy bidding