private void Btn_Change_Click(object sender, RoutedEventArgs e) { Home home = new Home(G_Username); User_Controller user = new User_Controller(); string _a_password = Txt_a_password.Password; string _b_password = Txt_b_password.Password; string _c_password = Txt_c_password.Password; var result = user.changePassword(G_Username, _a_password, _b_password, _c_password); if (result == 1) { MessageBox.Show("Change Password Success!"); } else if (result == 2) { MessageBox.Show("New Password Didnt Same!"); } else { MessageBox.Show("Wrong Current Password!"); } }