private void btnAddCustomer_Click(object sender, EventArgs e) { if (customerBUS.CheckCustomerInfomations(txtCustomerName.Text, txtCustomerIdentity.Text, txtCustomerAddress.Text, txtCustomerEmail.Text, true)) { Customer customer = new Customer(); customer.KeyId = 0; customer.CustomerName = txtCustomerName.Text; customer.CMND = txtCustomerIdentity.Text; customer.Address = txtCustomerAddress.Text; customer.Email = txtCustomerEmail.Text; customer.DateRegistered = DateTime.Now; if (customerBUS.SaveEntities(customer)) { MessageBox.Show("Thêm thành công"); txtCustomerName.Text = ""; txtCustomerIdentity.Text = ""; txtCustomerAddress.Text = ""; txtCustomerEmail.Text = ""; txtCustomerDateRegister.Text = ""; LoadCustomer(customerBUS.GetAll()); } else { MessageBox.Show("Có lỗi trong quá trình thêm khách hàng"); } } }