New way to save bowl number

using UnityEngine;
using System.Collections;

public class ActionMaster {
    public enum Action{Tidy, Reset, EndFrame, EndGame}
    private int roll =0;
    private int frame =0;

    private int[,] frameList = new int[10,3];

    public Action Bowl (int pins)
    {
        frameList [frame, roll] = pins;

        //For the error input;
        if (pins < 0 || pins > 10) {
            throw new UnityException ("Invaild pins number!");
        }

        //Handle last frame situation.
        if (frame == 10 - 1) {

            if (roll == 0) {//Last frame first roll;
                if (pins == 10) {
                    roll++;
                    return Action.Reset;
                }
            }

            if (roll == 1) {// Last frame second roll;
                if (isSpare () || frameList[frame,roll] == 10) {
                    roll++;
                    return Action.Reset;
                } else if (frameList [9, 0] == 10) {
                    roll++;
                    return Action.Tidy;
                } else {
                    return Action.EndGame;
                }
            }

            if (roll == 2) {// Last frame last roll;
                return Action.EndGame;
            }

        }

        //Handle the strike situation.
        if (pins == 10) {
            NextFrame ();
            return Action.EndFrame;
        }

        //Gneral situation.
        if (roll == 0) {
            roll =1;
            return Action.Tidy;
        } else {
            NextFrame ();
            return Action.EndFrame;
        }
    }

    void NextFrame ()
    {
        roll = 0;
        frame++;
    }

    bool isSpare ()
    {
        return (frameList[10-1,1-1] + frameList[10-1,2-1] >=10 && frameList[10-1,1-1] !=10);
    }
}