making progress bar in current app HELP!!!!!

Question

I really need help here, I have never coded before in my life, I actually just started this whole programming thing last night and chose C# as my code writer.

I made a notepad, fully functional, but I want to add a progress bar so when people open big files with this, they will see a bar showing the progress of the files being opened.

Anyone want to share with me how to do this? it would help a lot.