Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
    If cb1.Checked = True And cb2.Checked = False Then
        ListBox1.Items.Add(cb1.Text)
        If cb1.Checked = True And cb2.Checked = True Then
            ListBox1.Items.Add(cb1.Text)
        End If
    ElseIf cb2.Checked = True And cb1.Checked = False Then
        ListBox1.Items.Add(cb2.Text)
        If cb2.Checked = True And cb1.Checked = True Then
            ListBox1.Items.Add(cb1.Text)
        End If
    End If
End Sub