How to remove subitems in the label?

Hi guys,

I am currently working on my program to click on the listview items. I'm using listview mouseclick event to click on each listview item, I would like to know how I can get the messagebox to display to let me know that the subitems get remove in the label when I click on same checkboxes after when I add the subitems in the label?

Here's the code:

Code:

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Private Sub listView1_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
        Dim item As String = listView1.HitTest(e.Location).Item.SubItems(1).Text
        Dim a() As String = Nothing
        a = label1.Text.Split(","c)

        If label1.Text = "" Then
            label1.Text = item
        Else
            If checkeditem.Checked = False Then
                MessageBox.Show(a(j).Trim())
                label3.Text &= ", " & item
            Else
                If Not(label3.Text.Contains(item)) Then
                    MessageBox.Show("add it")
                Else
                    MessageBox.Show("remove it")
                End If
            End If
        End If
End Sub

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Any advice would be much appreciated

Thanks,
PillKilla