//Insert Button private void addButton_Click(object sender, EventArgs e) { if (_customerManagement.UniqueCustomerName(customerNameTextBox.Text)) { MessageBox.Show("Name already exits"); return; } //add Customer bool isAdded = _customerManagement.InsertCustomer(customerNameTextBox.Text, Convert.ToInt32(customerNoTextBox.Text), addressTextBox.Text, Convert.ToInt32(codeTextBox.Text)); if (isAdded) { MessageBox.Show("Saved"); } else { MessageBox.Show("Not Saved"); } //show showDataGridView.DataSource = _customerManagement.ShowCustomerInfo(); }