Return values string from list box

public string GetValueFromList(ListBox LstBox)
    {
        string Lst = "";
        if (LstBox.SelectedIndex > -1)
        {
            // Iterate through the Items collection of the ListBox and 
            // display the selected items.
            foreach (ListItem item in LstBox.Items)
            {
                if (item.Selected)
                {
                    Lst += item.Value + ",";
                }
            }
            Lst = Lst.Substring(0, Lst.Length - 1);
        }
        return Lst;
    }