private void cmdRemove_Click(object sender, EventArgs e)
        {
            if (selectedUser != null)
            {
                if (SelectedUserOKToRemove())
                {
                    selectedUser.Delete();

                    int i = lstUsers.SelectedIndex;

                    lstUsers.Items.Remove(lstUsers.SelectedItem);

                    if (i < lstUsers.Items.Count - 1)
                    {
                        lstUsers.SelectedIndex = i;
                    }
                    else if (lstUsers.Items.Count > 0)
                    {
                        lstUsers.SelectedIndex = 0;
                    }
                }
                else
                {
                    MessageBox.Show(this, "Delete cancelled.");
                }
            }
        }