private void btnSave_Click(object sender, EventArgs e) { if (ValidateDetail()) { if (ProductSelected != null) { try { bool result = productPresenter.Update(); if (result) { UpdateStocking(); MessageBox.Show("Update Success.", "Update Status"); this.Dispose(); } else { MessageBox.Show("Update Fail.", "Update Status"); } } catch (SqlException ex) { MessageBox.Show(ex.Message, "Update status"); } } else { try { bool result = productPresenter.Insert(); if (result) { UpdateStocking(); MessageBox.Show("Add Success.", "Insert Status"); this.Dispose(); } else { MessageBox.Show("Add Fail.", "Insert Status"); } } catch (SqlException ex) { if (ex.Message.Contains("duplicate")) { MessageBox.Show("Product ID is already existed. Please choose another.", "Insert Status"); } else { MessageBox.Show(ex.Message, "Insert status"); } } } } }