private void addButton_Click(object sender, EventArgs e) { if (_orderManager.AddMethod(Convert.ToInt32(customeridTextBox.Text), Convert.ToInt32(itemidTextBox.Text), Convert.ToInt32(quantityTextBox.Text))) { MessageBox.Show("Saved"); } else { MessageBox.Show("Not saved"); } showDataGridView.DataSource = _orderManager.ShowMethod(); }