Select The First Item In The Listbox?

im trying to get this program to select the first item from the listbox and store it as a string and then have it go to the next item i nthe box and store it as a string and so on , so like i would have it select the first item in the listbox say apples and then it stores that as the string Fruit and then it does something with it and then it goes to the next line in the listbox say oranges and stores it as the string fruit, but i want to do this my doing like fruit = listbox1+1 or something?