private void fillOrderList() { Data orderList = ShardDb.getOrderListByCustomerId(tbCustomerID.Text); if (!orderList.Success) { this.Close(); return; } dataGridViewOrder.DataSource = orderList.DataTable; dataGridViewOrder.Columns["id"].Visible = false; changeOrderDataGridViewHeader(); if (orderList.DataTable.Rows.Count > 0) { combBoxCity.Enabled = false; comboBoxStore.Enabled = false; } }