What Do I Need To Use?

I am working on a small project for myself to read through a plain text file, pick out certain elements, and show them in a scrolling window on my form. Below is my form:



The red box is where I want to locate whatever it is that I need to do this with. I have tried this several times over the years and could not make anything I knew of work the way I wanted it to. The items being read from the input are all a single line. The filtering, I have already worked out.

Any suggestions would be appreciated. Thank you. :)

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