Как в коде сделать чтоб при нажатии + в верхней лабель записывался результат?

private: System::Void button_plus_Click(System::Object^ sender, System::EventArgs^ e) {
    math_action('+');
}
    private: System::Void math_action(Char action) {
 
        this->result_lab->ForeColor = Color::White;
        this->first_num = System::Convert::ToDouble(this->result_lab->Text);
        this->user_action = action;
        this->result_lab->Text = "0";
        this->result_lab2->Text = this->first_num + " " + action;
    }

private: System::Void button_plus_Click(System::Object^ sender, System::EventArgs^ e) {
    math_action('+');
}
    private: System::Void math_action(Char action) {
 
        this->result_lab->ForeColor = Color::White;
        this->first_num = System::Convert::ToDouble(this->result_lab->Text);
        this->user_action = action;
        this->result_lab->Text = "0";
        this->result_lab2->Text = this->first_num + " " + action;
 
    }