private void DeleteState_Click(object sender, EventArgs e)
        {
            var state = new StateOrDistrict(ListState.SelectedItem.ToString(), TableState, ListCountry.SelectedItem.ToString());

            state.Delete(sqlConnection);

            ListState.DataSource = StateOrDistrict.LoadListState(TableState, ListCountry.SelectedItem.ToString(), sqlConnection);
        }
        private void DeleteDistrict_Click(object sender, EventArgs e)
        {
            var district = new StateOrDistrict(ListDistrict.SelectedItem.ToString(), TableDistrict, ListState.SelectedItem.ToString());

            district.Delete(sqlConnection);

            ListDistrict.DataSource = StateOrDistrict.LoadListState(TableDistrict, ListState.SelectedItem.ToString(), sqlConnection);
        }