get set on array

hello, using follow:

        private int[] walls = new int[4]{-1,-1,-1,-1};            public int[] walls          {              { return walls; }              set { walls = value; mb.redraw(); }          }

but when this: 

walls[2] = 0;

it use instead set, how can everytime value on array changed launch mb.redraw? have create specific method this?

you use indexer, class containing 'walls' need centered around 'walls' make sense:

	public int this[int index] 	{ 		get 		{ 			return walls[index]; 		} 		set 		{ 			walls[index] = value; 		} 	}

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