private void RefreshUserList()
        {
            BusinessObjects _businessObjects = new BusinessObjects();
            List<UserAccount> users = _businessObjects.GetAllUserAccounts();
            lstUsers.Items.Clear();

            if (users != null)
            {
                foreach (UserAccount user in users)
                {
                    ListViewItem item = new ListViewItem(
                        new string[] { user.UserName, user.HighestPermission.ToString() }
                        );
                    this.lstUsers.Items.Add(item);
                }
            }
        }