Save And Read To And From A Text File?

I have a form to calculate some settings. It works just fine. I will input some decimal numbers to 8 deferent Textboxes. For example I input 40.0098 to textbox1. When I press a button my form will calculate these setting, and it will generate some new values. What I want to do is save the user inputs and the generated values to a text file each input or value has its own line it should by after the name of that input or value so the user could read the info contain in this text file, so per say line 1 of this text file will represent the input of textbox 1. it should save it as "parameter 1 = 40.0098" to line 1 of the text file I also want to be able to load this text file to my form (only specific lines) when I press another button I should get a dialog box to be able to select the text file, once I do that my form should read line one and only the input what after the "=" so textbox1 should now show 40.0098 only.