private void addPerson_Click(object sender, EventArgs e) { errorListBox.DataSource = null; Person person = new Person(); person.FirstName = personFnameText.Text; person.LastName = personLnameText.Text; person.EmailAddress = personEmailText.Text; person.PhoneNumber = personPhone.Text; // (bool IsAdded, List <string> errorList) = _businessLogic.AddPerson(person); if (IsAdded) { errorListBox.Visible = false; MessageBox.Show("Added Successfly"); return; } errorListBox.Visible = true; errorListBox.DataSource = errorList; personFnameText.Clear(); personLnameText.Clear(); personEmailText.Clear(); personPhone.Clear(); // }