Advanced options to write and read data in .txt files

Hello

I am trying to save data from an application I am creating to .txt files. Basically, I have many Windows forms and would like to save all the information in one project in one single file.

I've been learning about using .txt files to save data from a form. And Read. But what I found so far is quite simple.

I would like to know if there is a way to save all my information (from many forms) in one single .txt file. In any way that I can later read this file and identify what is each data in the file, so I can write them in different textboxes in my windows form when the user opens a project he saved.

Thanks in advance.