List view control problem

Hi,

I am building a dialog box with 3 edit controls, a list view control in report view and 3 push buttons. With the buttons I want to "Add", "Change" and "Delete" items in the list view control, so for every button I have a button click event handler. See below my event handler for an "Add" button click :

void CBuildShareListDlg::OnAddShareItem()
{
    // Retrieves the following data from the dialog box :
    // CListCtrl    m_lvcShareList;
    // long         m_lVolume;
    // CString      m_strDate;
    // float        m_fRate;
    if ( UpdateData() != TRUE )
        return;
        :
        :
    // Build a CTime object "time" out of m_strDate.

    LV_ITEM      lvItem;
    int          iActItem, iItem;
    TCHAR        szText[3][15];

    lstrcpy( szText[0], ( LPCTSTR ) time.Format( "%d/%m/%Y" ) );
    _stprintf( szText[1], "%f", m_fRate );
    _strprint( szText[2], "%u", ( UINT) m_lVolume );

    iItem = ?  // THAT IS MY PROBLEM.

    for ( int iSubItem = 0; iSubItem < 3; iSubItem++ )
    {
        lvItem.mask = LVIF_TEXT | ( iSubItem == 0 ? LVIF_IMAGE : 0 );
        lvItem.iItem = ( iSubItem == 0 ) ? iItem : iActItem;
        lvItem.iSubItem = iSubItem;
        lvItem.pszText = szText[iSubItem];
        lvItem.iImage = 0;

        if ( iSubItem == 0 )
            ASSERT( ( iActItem = m_lvcShareList.InsertItem( &lvItem ) )!= -1 );
        else
            ASSERT( m_lvcShareList.SetItem( &lvItem ) != -1 );
    }
}

Question 1 :
According to my documentation iItem is a zero based index, but must these indexes be ordered starting from 0 and incremented by 1 each time a new ShareItem is added, or is it just a value that identifies an item in the control.

Question 2 :
When I write my handlers for the "Change" and "Delete" button clicks, how can I figure out which item in the list view is selected. A little bit of code would be very appreciated.


Thanks in advance for everyone that is willing to help me.