Detecting multiple items in a listbox - windows forms

I don't know why this isn't working for me, but it isn't , and I need some advice.

I have a windows forms app with a ListBox. The examples in the MSDN documentation say to load it up with ListItems - but I can't find a ListItem object in Windows Forms. I did find one in System.Web.UI.WebControls, so I added that, and build my ListBox like this:

            Dim l As ListItem = New ListItem("MyItem")
            ListBox1.Items.Add(l)

I do this for each of several items, and that loads the listbox.

The listbox has the multiselect property on. So I select several items, and then try to detect them like this:

                For Each li As ListItem In lstStyles.Items
                    If li.Selected Then
                    ..do something
                    end if
                Next

But it never detects a selected item. Never. So what gives? What am I doing wrong?
LVL 8
toddhdAsked:
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Mike TomlinsonMiddle School Assistant TeacherCommented:
   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim i As Short

        For i = 1 To 10
            ListBox1.Items.Add("Item" & i)
        Next
        ListBox1.SelectionMode = SelectionMode.MultiSimple
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim s As String

        For Each s In ListBox1.SelectedItems()
            Debug.WriteLine(s)
        Next
    End Sub
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