Listview With Multi Columns To Array?

I am currently using the following code to store all of the items from a listbox control in an array, and then build a string based on the array items, trimming the last two character of the string to remove the ", ". I am looking to do something similiar for my multicolumn listview control but am concerned about how to store the multiple subitems for each item in the array.

Dim myStr (listbox1.items.count) as String
'store all active medications information in an array & build a string
For i As Integer = 0 To listbox1.Items.Count - 1

[code].....