gistfile1.cpp

      if (materialDataForm.ShowDialog() == DialogResult.OK)
            {
                MaterialController materialController = new MaterialController();
                ErrorList errors;
                int code = (int)materialDataForm.numCode.Value;
                string name = materialDataForm.txtName.Text;
                float amount = (float)materialDataForm.numAmount.Value;
                string unit = materialDataForm.cbUnit.Text;
                decimal price = materialDataForm.numPrice.Value;

                errors = materialController.Add(code, name, amount, unit, price);

                if (errors.IsEmpty())
                {
                    materialDataForm.Close();
                }
                else
                {
                    MessageBox.Show(errors.ToString());
                }
            }
            else
            {
                materialDataForm.Close();
            }