Problem with Listview Double Click

I am trying to create a media player with a playlist... I have all the code to add the media and the play but I am having problems with the double click. I have found code in another project but I think I am missing something

' If any item is dbl clicked in listview, similar techniques as in listbox are implemented to show that 
        ' the song really originated from the listview, and play the song
        ' this identification helps in playing the next song (if playlist)

        MDIParent1.lblMusic.Tag = ""
        MDIParent1.lblMusic.Tag = ListView1.FocusedItem.SubItems(4).Text

        If flag = 0 Then
            flag = 1
        Else
            flag = 0
        End If
        MDIParent1.lblMusic.Text = ListView1.FocusedItem.Index
        MDIParent1.lblMusic.Text = flag


        If CheckBox2.Checked = True Then
            ListView1.ListViewItemSorter = New ListViewComparer(5, SortOrder.Descending)
            ListView1.Sort()
        End If