private void ConfirmCommandExecute() { try { if (EntryValidation.IsOnlyLetters(user.FirstName) == false) { MessageBox.Show("First name can only contain letters. Please try again", "Invalid input"); return; } if (EntryValidation.IsOnlyLetters(user.LastName) == false) { MessageBox.Show("Last name can only contain letters. Please try again", "Invalid input"); return; } databaseService.AddUser(user); UserView userView = new UserView(user); MessageBox.Show("User registered successfully.", "Info"); firstTimeAccessView.Close(); userView.Show(); } catch (Exception ex) { MessageBox.Show(ex.ToString()); } }