save to listbox

how can i save multiple controls to one listbox item?

Ok, that adds textbox1.text as an item, but what if I want to add textbox1,textbox2,textbox3.text to ONE item. that way when i press my load button, it will take the contents of textbox1,2,3 and put it back to each control.

also, how can i have it stay saved even when I close my app. when i close my app, all my listbox items disappear. -_-