How do I copy all items in a listview to a text file?

I want to be able to click a button that takes all items and subitems in a listview and copies them to a comma delimited textfile. I have absolutely no idea how to do this so would appreciate any help with this.

textfile path c:\ListView
textfile name: lstMenu.txt

the listview name is lstMenu

item column name: PooX
subItem1 column name: Value
subitem 2 column name: Code 1
subItem 3 column name: Code 2

I do not need the column header names copied just the contents of the listview. I row of listview = 1 row of comma delimited text

Thanks

PBLack